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STRUCTURE OF ATOM

Total questions: 20

Worksheet time: 12mins

Name
Class
Date
1.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A molecule
d)
A nucleus
2.
The particles with no charge in an atom are the _______.
a)
electrons
b)
neutrons
c)
protons
d)
protons and neutrons
3.
a)
Nucleus, positive
b)
Nucleus, negative
c)
Nucleus, neutral
d)
Electron Cloud, positive
4.

How many protons are there in an atom of aluminium?

a)

27

b)

13

c)

14

d)

17

5.
What are valence electrons?
a)
electrons on the first orbital always
b)
nucleus
c)
the outermost shell
d)
the number of electrons on the outermost orbital
6.
Oxygen’s atomic number is 8. This means that an oxygen atom must have
a)
8 electrons
b)
8 protons
c)
8 neutrons
d)
a mass number of 8
7.

99.9% of the atom's mass is found where?

a)

nucleus

b)

protons

c)

electron cloud

d)

neutrons

8.

Rutherford concluded that the amount of positive charge varies

a)

with the amount of electrons in the nucleus.

b)

as the the amount of isotopes varies.

c)

with the amount of neutrons in the nucleus.

d)

with different elements.

9.

Neutrons have almost exactly the same mass as

a)

electrons.

b)

positrons.

c)

protons.

d)

quarks.

10.

James Dalton proved that the true nature of the atom could best be described as resembling "plum pudding."

a)

True

b)

False

11.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
12.
Which statement best describes an electron?
a)
Smaller mass than a proton and a negative charge
b)
Smaller mass than a proton and a positive charge
c)
Greater mass than a proton and a negative charge
d)
Greater mass than a proton and a positive charge
13.
Most of the mass in an atom is concentrated in the...
a)
electrons
b)
nucleus
c)
protons
d)
empty space
14.
The first energy level can hold up to, how many electrons?
a)
8
b)
4
c)
2
d)
5
15.
The second energy level can hold up to, how many electrons?
a)
2
b)
8
c)
10
d)
12
16.
What are the 3 particles that make-up the atom?
a)
protons, neutrons, and isotopes
b)
neutrons, isotopes, and electrons
c)
positives, negatives, and electrons
d)
protons, neutrons, and electrons
17.

Mass minus Atomic Number Equals (M-A=?)

a)

Neutrons

b)

Protons

c)

Nucleus

d)

Atom

18.

The------ particle determines the identity of what element you have'

a)

electron

b)

proton

c)

neutron

d)

valence shell

19.
 What is the mass number of this element?
a)
5
b)
27
c)
32
d)
59
20.

WhIch sub atomic particle vary between isotopes of an element?

a)

protons, electrons, and atomic mass

b)

protons, electrons, and atomic number

c)

neutrons and electrons

d)

neutrons only

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