Free Printable ATOMS

1.

Compared to the charge and mass of a proton, an electron has ______.

a)

the same charge and a smaller mass

b)

the same charge and the same mass

c)

an opposite charge and a smaller mass

d)

an opposite charge and the same mass

2.

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ____.

a)

deuterons (H-2)

b)

protons

c)

neutrons

d)

unoccupied space

3.

A proton has approximately the same mass as ___.

a)

a neutron

b)

a beta particle

c)

an alpha particle

d)

an electron

4.

Which symbols represent atoms that are isotopes?

a)

C-14 and N-14

b)

I-131 and I-131

c)

O-16 and O-18

d)

Rn-222 and Ra-222

5.

Which atom contains exactly 15 protons?

a)

P-32

b)

O-15

c)

S-32

d)

N-15

6.

An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of _____.

a)

5

b)

8

c)

6

d)

11

7.

What is the mass number of an atom that contains 28 protons, 28 electrons, and 34 neutrons?

a)

28

b)

62

c)

56

d)

90

8.

Almost the entire mass of an atom is concentrated in the _____.

a)

Protons

b)

Nucleus

c)

Electrons

d)

Neutrons

9.

Electron was discovered by___________.

a)

Chadwick

b)

Rutherford

c)

Thomson

d)

Millikan

10.

Carbon-12 atom has_____________.

a)

6 electrons, 12 protons, 6 neutrons

b)

12 electrons, 6 protons, 6 neutrons

c)

6 electrons, 6 protons, 6 neutrons

d)

18 electrons, 6 protons and 6 neutrons

11.

Mass number is equal to the________.

a)

number of protons + number of electrons

b)

number of protons + number of neutrons

c)

number of neutrons + number of electrons

d)

number of electrons

12.

The development of the concept that elements have isotopes helps explain why atomic ______.

a)

masses are not whole numbers

b)

masses differ from atomic numbers

c)

nuclei are charged

d)

nuclei are neutral

13.

In an experiment by Rutherford, the deflection of alpha particles backward when shot at gold foil indicated _____.

a)

all the positive charge and most of the mass of the atom was concentrated in a small volume

b)

all of the mass and charge of the atom were contained in the same region

c)

the alpha particle was very light and positively charged

d)

all matter was continuous and impenetrable

14.

When Rutherford bombarded gold foil with positively charged alpha particles, most of the particles went through but some were deflected back. Rutherford concluded that atoms _____.

a)

have negative charges

b)

are solid spheres

c)

contain neutral particles

d)

have positive nuclei

15.

Which one of the following would contain the other four?

a)

compound

b)

element

c)

nucleus

d)

molecule

e)

atom

16.

Positive ions are formed from neutral atoms by the loss of ____.

a)

neutrons

b)

electrons

c)

protons

d)

energy

17.

The particles which have equal but opposite electrical charges are _______.

a)

electrons and neutrons

b)

protons and electrons

c)

protons and hydrogen nuclei

d)

neutrons and protons

18.

Which of the following statement is correct?

a)

A proton is a positively charged particle in the nucleus

b)

A proton is a negatively charged particle in the nucleus

c)

Neutrons and protons are charged particles in the nucleus

d)

None of these

19.

The neutral atoms in a given sample of an element could have different _______.

a)

number of protons

b)

atomic numbers

c)

mass numbers

d)

number of electrons

20.

Which of the following is a characteristic of an atom?

a)

atoms are alike

b)

An atom is the smallest particle of matter

c)

An atom is the smallest particle of an element with the properties of the element

d)

All atoms have the same mass, which equals l a.m.u

21.

The number of protons in the nucleus of an atom determines the _______.

a)

mass number

b)

atomic mass

c)

atomic number

d)

isotopic mass

22.

Elements can be combined chemically to form ______.

a)

compounds

b)

colloids

c)

suspension

d)

solutions

23.

A characteristic of the nucleus of an atom is that _______.

a)

it has a positive charge equal to the atomic number

b)

its mass is small compared to the mass of the atom

c)

it contains all the electrons of the atom

d)

the electrons and the protons balance each other

24.

Atom is to element, as the molecule is to ____.

a)

mixture

b)

compound

c)

atom

d)

solution

25.

Scientists visualize the way atoms behave by using ____.

a)

pictures

b)

microscopes

c)

genes

d)

models

ATOMS

Total questions: 25

Worksheet time: 18mins

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