Free Printable THE ATOM

1.

What is the name of the path an electron takes as it moves around the nucleus?

a)

line

b)

trajectory

c)

speed

d)

orbit

2.

The mass of a proton is approximately (a) times bigger than the mass of an electron.

3.

A (a) atom has the same number of protons and electrons.

4.

Which particle moves around the nucleus?

a)

Neutron

b)

Electron

c)

Proton

5.

When an atom loses electrons, it becomes an ion with ______charge

a)

positive

b)

negative

6.

When an atom gains electrons, it becomes an ion with _______charge

a)

positive

b)

negative

7.

The atoms with the same number of protons but different number of neutrons are called...

(a)

8.

Between electrons and protons there is a force of....

a)

attraction

b)

repulsion

9.

Reorder the following events

a)

Democritus creates the word ATOMOS

b)

Thomson creates the plum pudding atomic model

c)

Rutherford creates the planetary atomic model

d)

Bohr creates the pre-quantum atomic model

e)

Schrödinger creates the cloud atomic model

1)

2)

3)

4)

5)

10.

Match the following:

Niels Bohr

The plum pudding atomic model

E. Rutherford

The planetary atomic model

J.J. Thomson

The prequantum atomic model

E. Schrödinger

The cloud atomic model

Democritus

The word ATOMOS

11.

Which equation describes the following event: one atom of potassium (K) loses one electron and becomes an anion?

a)

$k\ -1e^{-^{ }}\rightarrow\ k^+$

b)

$k\ -1e^-\ \rightarrow\ k^-$

12.

Which equation describes the following fact: one atom of bromine (Br) gains one electron and becomes an anion?

a)

$Br\ +\ 1\ e^{-^{ }}\rightarrow\ Br^-$

b)

$Br\ +\ 1\ e^-\rightarrow\ Br^+$

13.

Which equation describes that an atom of Calcium loses 2 electrons and becomes a cation?

a)

$Ca\ -\ 2\ e^{-^{ }}\rightarrow\ Ca^{2+}$

b)

$Ca\ -\ 2\ e^-\rightarrow\ Ca^{2-}$

14.

What represents the atomic number of an element?

a)

The number of protons we can find in any atom of that element

b)

The number of neutrons we can find in any atom of that element

c)

The number of nucleons we can find in any atom of that element

d)

The number of electrons we can find in any atom of that element

15.

What does Z stand for?

a)

the number of protons

b)

the number of neutrons

c)

the number of nucleons

16.

What does A stand for?

a)

the number of protons

b)

the number of neutrons

c)

the number of nucleons

17.

What do we call Z?

a)

the atomic number

b)

the mass number

18.

What do we call A?

a)

The atomic number

b)

The mass number

19.

Consider the isotope in the picture. What is the number of protons and neutrons it contains?

a)

53 protons and 131 neutrons

b)

131 protons and 53 neutrons

c)

53 neutrons and 78 protons

d)

53 protons and 78 neutrons

20.

Are all the atoms of carbon the same?

a)

Yes. Of course! That what Dalton said in his atomic theory of matter.

b)

No. All of them have the same number of protons but can have different number of neutrons.

THE ATOM

Total questions: 20

Worksheet time: 14mins

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