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6.2 PERIODICITY-ATOMIC/IONIC RADII

Total questions: 25

Worksheet time: 2hrs 5mins

Name
Class
Date
1.

As you move down the periodic table atoms get bigger. This is because ____________.

a)

The atoms have more effective nuclear charge.

b)

The atoms have more protons.

c)

The atoms have more energy levels

d)

The atoms have more neutrons

2.
As you move across the periodic table atoms tend to get smaller because, ______________.
a)
the atoms have more mass.
b)
the atoms have less mass
c)
the atoms have more protons.
d)
the atoms have less electrons.
3.
Which of the following will have a larger radius than Zinc?
a)
Gallium
b)
Aluminum
c)
Magnesium
d)
Strontium
4.

The more protons there are, the ____ .

a)

Weaker the attraction

b)

Smaller the electrons

c)

Stronger the attraction

d)

bigger the electrons

5.

Which one has the largest radius?

a)

Lithium (Li, atomic no 3)

b)

Boron (B, atomic no 5)

c)

Neon (Ne, atomic no 10)

d)

Nitrogen (N, atomic no 7)

6.

Which of the following elements would be the largest: potassium (Ar = 19), zinc(Ar = 30), bromine(Ar = 35) or rubidium(Ar = 37)?

a)

rubidium

b)

zinc

c)

bromine

d)

potassium

7.

Why is iodine larger than bromine?

a)

iodine has a greater number of electrons than bromine

b)

iodine has a greater number of protons than bromine

c)

iodine has more occupied energy levels and greater shielding than bromine

d)

iodine has more neutrons than bromine

8.
The diameter of an atom is also the distance between  _____ .
a)
The total length of two atoms
b)
The centers of two atoms
c)
An electron to a proton
d)
Two neutrons
9.
When you move left across the table, the radius ____. When you move down the table, the radius ____.
a)
Increases, Decreases
b)
Decreases, Increases
c)
Increases, Increases
d)
Decreases, Decreases
10.

As you go down the Periodic Table, the ______ increases.

a)

Principle Quantum Number

b)

Effective nuclear charge

c)

proton repulsion

d)

Intermolecular forces

11.

Which element's atom is the smallest?

a)

Magnesium

b)

Carbon

c)

Berilium

d)

Aluminium

12.
Which is larger... P or P3- ?
a)
P3- because it gains an energy level
b)
P3- due to extra electron repulsion
c)
P because it loses an energy level
d)
P because of extra electron repulsion
13.
Which is smaller... Mg or Mg2+ ?
a)
Mg because it gains an energy level
b)
Mg due to extra electron repulsion
c)
Mg2+ because of extra electron repulsion
d)
Mg2+ because it loses an energy level
14.

Across a period from left to right , atomic radius

a)

decreases

b)

increases

c)

increases, then decreases

d)

decreases, then increases

15.
What makes a valence electron more attracted to the nucleus?
a)
less distance between the nucleus and having less protons
b)
less distance between the nucleus and having more protons
c)
more distance between the nucleus and having less protons
d)
more distance between the nucleus and having more protons
16.

Atomic radius generally increases as we move __________.

a)

down a group and from right to left across a period

b)

up a group and from left to right across a period

c)

down a group and from left to right across a period

d)

up a group and from right to left across a period

17.

Which of the following elements has the smallest atomic radius?

a)

Sulfur

b)

Chlorine

c)

Aluminum

d)

Sodium

18.
As you move across the periodic table atoms tend to get smaller because, ______________.
a)
the atoms have more mass.
b)
the atoms have less mass
c)
the atoms have more protons.
d)
the atoms have less electrons.
19.
List the following from largest to smallest atomic radius.
P, Cs, Co, Sr
a)
P, Co, Sr, Cs
b)
P, Cs, Co, Sr
c)
Cs, Sr, Co, P
d)
Sr, Cs, Co, P
20.

When Zeff increases, the nucleus attraction

towards electrons become

a)

Weaker

b)

Stronger

c)

Remain the same

21.

What happens to atomic radius across a period?

a)

the atoms get bigger because the nucleus is bigger as more protons are added

b)

the atoms get bigger because there are more ve-

c)

the atoms get smaller because with more attraction to the extra protons, the e- cloud moves closer to the nucleus

22.

Going down the group, the atomic radius of elements increases. Why is that so?

a)

the number of shell (n) increases

b)

Shielding effect increases

c)

Nucleus attraction towards valence electrons weaker

d)

All of the above

23.

Atomic radius is...

a)

the relative size of the atom's nucleus

b)

the relative size of the atom's electron cloud

c)

the energy required to shield the outer electrons from the nucleus

d)

a measure of the ability of an atom to attract electrons

24.

Across a period atomic size become smaller because

a)

Attraction within nucleus decrease

b)

Effective nucleus charge increase (Zeff)

c)

Effective nucleus charge decrease (Zeff)

d)

Repulsion within electron increase

25.

Atomic radius generally increases as we move __________.

a)

down a group and from right to left across a period

b)

up a group and from left to right across a period

c)

down a group and from left to right across a period

d)

up a group and from right to left across a period

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