Transcript What is the electron configuration of Magnesium?

Semester 1 slides from units 1-5 tests
Also:
• make sure to do notebook
assignments for unit 6- there are
many review questions
• Density Measurement lab has
questions for one of the open
response
• Midterm and Chapter 8 open
response are also on the test
The Atomic Number is the total number
of which particles in the nucleus?
A. ions
B. electrons
C. protons AND neutrons
D. protons
Only protons and neutrons are in the
nucleus. The atomic number is the number
of protons or electrons in an atom. So D is
correct
What is the next atomic orbital in
the series 1s 2s?
A. 4s
B. 3p
C. 2p
D. 2s
C. This is the order
4p _ _ _
3d _ _ _ _ _
4s _
3p _ _ _
3s _
2p _ _ _
2s _
1s _
The sodium ion has a charge of
positive one, has how many
electrons would it have?
A.1
B.10
C.11
D.9
Sodium the atom has 11
for an atomic number, so
it has 11 electrons. When
it becomes a +1 ion it
loses one electron, so
has only 10.
What does the number 14 in
carbon-14 represent?
A.The charge
B.Number of electrons
C.Atomic Number
D.The mass number
Carbon is element #6 which tells the
number of protons and electrons. The
14 is the mass number which is the
sum of protons and neutrons.
What is the electron configuration
of Magnesium?
A) 1s2 2s2 2p3 3s2 3p6
2
2
6
1
B) 1s 2s 2p 3s
C) 1s2 2s2 2p6 3s2
2
2
3
2
4
D) 1s 2s 2p 3s 3p
Mg has 12 electrons which is shown in C.
[BTW: A and D don’t have the correct
sequence.] open response has configuration!
What is the electron configuration
of Magnesium ion?
A) 1s2 2s2 2p3 3s2 3p6
2
2
6
B) 1s 2s 2p
C) 1s2 2s2 2p6 3s2
2
2
3
2
4
D) 1s 2s 2p 3s 3p
Mg+2 ion has 10 electrons which is shown in B.
[BTW: A and D don’t have the correct
sequence.] open response has configurations!
Which of the following statements
is not true?
A.Neutrons are located in the
nucleus.
B. Ions are always positively
charged.
C.The number of neutrons in
Aluminum is 14.
D. Electrons is always the same
number as the protons.
Which of the following statements
is not true?
A.Neutrons are located in the nucleus.
true
B. Ions are always positively charged.
Ions can also be negative
C.The number of neutrons in Aluminum
is 14. Al has a mass of 27 - an atomic
number of 13, to give 14 neutrons.
D. Electrons is always the same number
as the protons in atoms. True [but not for
ions]
The sulfur ion, has a charge of
negative 2, how many electrons
does it have?
A) 20
B) 18
C) 16
D) 2
Sulfur has an atomic
number of 16. To become a
negative 2 ion, it would
gain 2 electrons, so that is
18.
Given: Protons 23, mass 50,
Electrons 23. What element is this?
A. Ti
B. Sc
C. V
D. None of
these
Since there are 23
protons, the element is V
because that is it’s
atomic number. The
mass can vary from the
periodic table because
there could be isotopes
What determines the atomic mass?
a.) Protons and Neutrons
b.) Weighted average of isotope masses
c.) Neutrons and Electrons
d.) None of the above
e) 2 of the above
E both a and b.
What is the electron
configuration of Aluminum?
a.) 1s2 2s2 2p2 3s23p24s1
b.) 1s2 2s2 2p6 3s23p1
c.) 1s2 2s2 2p6 3s23p2
d.) 1s2 2s2 2p6 3s23p24s1
B 13 electrons and correct
sequence
How many valence
electron are in a carbon
atom?
A.8
B.5
C.9
D.4
d. 4 Check roman
numerals on
column heading
True or false; 4 electrons
are shared in a double
covalent bond
A.True
B.False
Each bond is a
shared pair of
electrons. So 4
are shared in a
double bond.
Which combinations of
elements will give
molecular compounds?
A.metal+metal
B.metaloid+nonmetal
C.Nonmetal+nonmetal
D.metal+nonmetal
E.both B and C
E
How many valence
electrons are in a nitrogen
atom?
A. 8
B. 4
C. 6
D. 2
E. none of these
N has 5 valence
electrons. Check
the column
heading roman
numerals
Which is not a poor conductor
of electricity?
a) nonmetals
b) metals
c) transition metals
d) both b and c
D. Note the “not”
What element is in the same period
as Phosphorus?
A) Arsenic
B) Magnesium
C) Nitrogen
B period is
“row” on
periodic table
and Mg is in
the same row
What does an Ionic compound look like at
room temperature?
A
B
C
A. Ionic compounds are crystals at
room temp which are closely
packed organized particles.
Which is an alkali metal?
A) Copper
B) Magnesium
C) Radon
D) Sodium
Sodium is in column 1
which are the alkali
metals. Copper is a
transition metal.
Magnesium is alkali
earth metal. Radon is
a noble gas,Halogens
column 7
The closeness of a
measurement to its true value
is a measure of its ______
a. Precision
b. Accuracy
c. Reproducibility
d. Usefullness
B
Which of the following
is a physical change?
a. Corrosion
b. Explosion
c. Evaporation
d. Rotting Food
C
A gallon of feathers has less mass than a
gallon of water because it____
A. takes up more space
B. has less matter
C. has a definite composition
D. has a lower specific heat
B
What are the columns of the
periodic table called?
A. orbitals
B. configurations
C. periods
D. families
D
What element in the second period has the
smallest atomic radius?
A. lithium
B. potassium
C. neon
D. carbon
The second period is
the second row. Since
radius decrease left to
right Ne is correct
since it is the most
right.
A chemical change is involved in
which of these processes?
A) Freezing
B) Evaporation
C) Rusting
C. note the
change in color
What is shown by a chemical formula?
A) How elements are joined in
the compound
B) Total mass of reactants
C) Elements that are present in
the compound
D) Ratio of elements present in
the compound
Although C is correct, D is more correct and
should be selected.
(
) / Volume = Density. Fill in
the blank
A. Weight
B. Mass
C. Length
D. Temperature
B. Do you think
this would be on
the final?
Probably not,
expect to have to
calculate one of
the variables
If the mass of a block = 40.25kg &
volume = 3.38L, what is the density?
A) 42 kg/L
B) 11.9 kg/L
C) 0.08 kg/L
40.25/3.38
= 11.9 kg/L
How do you determine an
isotope?
A) Interrogate it
B) See if the number of protons is the same
C) See if the neutrons are the same
B
Helium is in what state of matter
at room temperature?
A) Nothing
B) Everything
C) Plasma
D) Gas
He is in
the noble
gas
family.
What could be the units for
Density?
A.) mL/grams
B.) grams
C.) m2
D.) g/mL
Needs to
be mass /
volume
Sulfur Periodic Symbol Is...
A.) Si
B.) K
C.) Na
D.) As
E.) S
S
Which set of measurements are
most precise?
A) 2.2, 2.4, 2.3
B) 2,3,2,4
C) 100,10.0,100
D) 1,2,3,4,5,6,7
A because
the
difference is
the smallest
Which results are most precise?
A) r2 = 0.98
B) r2 = 0.01
A because
the r2 is
near 1
Which are most accurate if the
accepted value is 350.
A) 300, 250, 233
B) 349, 351, 350
C)3.55, 3.45, 3.50
D) 345, 345, 346
B because the
average is most
close to 350.
BTW: D is most
precise
Given the measurements 347, 345,
346. What is the percent error if the
accepted value is 350.
A) 4
B) 99%
C) 1.1 %
D) 0.011
The average is
346 which is 4
from the
accepted. 4/350
*100 = 1.1%
How many unpaired electrons are
in a Phosphorus atom? Draw the
orbital diagram to decide.
A.
B.
C.
D.
0
3
1
2
3p _ _ _
3s _
2p _ _ _
2s _
1s _
Which would definitely tell you that
a chemical reaction has occurred?
A.
B.
C.
D.
E.
Mixing two liquids makes a solid
Bubbles form
Color change
Solid changing to a liquid
Liquid changing to gas
A
What is the charge of a Anion?
A. No charge
B. Positive charge
C. Dependent on the size of the nucleus
D. Negative charge
D
If more solute is added to a
solution
a-the concentration decrease
b-the mass of the solvent decreases
c-the solution becomes more concentrated
Concentration refers to the ratio
of solute to solvent, so the
solution would become more
concentrated.
CO2 is an ionic compound.
A) true
B) False
Carbon and
oxygen are
both
nonmetals, so
this would be
covalent
Which of the following is a
compound?
A) H
B) H2O
C) H-3
D) CO2
E) B&D
E
All atoms of the same element have
the same_____.
a. number of neutrons
b. number of protons
c. mass numbers
d. mass
B also known as atomic number
Isotopes of the same element have
the different...
a) number of neutrons
b) number of protons
c) mass number
d) mass
Same
number of
protons,
mass and
neutrons
vary
How many electrons does the
fluorine ion have?
A) 8
B) 9
C) 10
D) 2
F is element 9, so the
atom would have 9
electrons. F is in the
column that forms -1
ions which happens
by gaining an
electron, so the
correct answer is 10
Which of the following statements correctly
compares the relative size of an ion to its neutral
atom?
a. The radius of a cation is identical to the
radius of its neutral atoms.
b. The radius of an anion is smaller than the
radius of its neutral atom.
c. The radius of an anion is identical to the
radius of its neutral atom.
d. The radius of a cation is smaller than the
radius of its neutral atom.
Which of the following statements correctly
compares the relative size of an ion to its neutral
atom?
a. The radius of a cation is identical to the radius of its
neutral atoms. Cations are more small because
they lose electrons
b. The radius of an anion is smaller than the radius of
its neutral atom. Anions are more large because
they gain electrons
c. The radius of an anion is identical to the radius of
its neutral atom. Anions are more large because
they gain electrons
d. The radius of a cation is smaller than the radius of
its neutral atom. Cations are more small because
they lose electrons
How many unpaired electrons are
on a boron atom if you use the Dot
diagram?
A) 1
B) 3
C) 0
D) 2
B
Which of the following is a homogeneous
mixture
A) Coffee
B) Ice water
C) Water & Sand
D) Dust particles in Air
Homogeneous
means “one
phase” . Coffee
is the only one
that fits that
description
Which of the following are in the
same period as lithium?
a) carbon
b) magnesium
c) sodium
d) hydrogen
Period means
“row” on
periodic table,
so Carbon is
correct
Which of the following
covalent bonds in the
most polar?
A.
B.
C.
D.
H-Br
H-I
H-F
H-Cl
Electronegativity is
most great at the
top of a column, so
HF has the biggest
difference
A molecule with a double covalent
bond is? Hint: draw the electron dot
diagram.
A.
B.
C.
D.
H2O
Cl2
O2
N2
See p 218
and table
8.1
Which combinations of elements
will give ionic compounds?
a.) metalloid+non-metal
b.) non metal+non metal
c.) metal + metal
d.) metal + non metal
e.) more than one of these
D
A bond formed between a silicon
atom and an chlorine atom is likely
to be...
a.) non polar covalent
b.) ionic
c.) polar covalent
Silicon is a metalloid and chlorine
is a nonmetal so covalent. Cl is to
the right of Si, so it has a higher
electronegativity which makes the
bond polar