'The Atom' Chemistry Worksheet printable pdf download

Quiz Unit 2 Lesson 2-6: The Atom

Form

Multiple Choice.

Choose the best answer and write the letter and word/phrase that follows it.

What is the

mass number

of an atom that has 9 protons, 9 electrons, and 11 neutrons?

A. 18

B. 20

C. 2

D. 29

The chart below shows the atomic numbers and mass numbers for two elements.

Element 1 Element 2

Mass number

Atomic number

Number of protons

How many more neutrons does element 2 have than element 1?

A. 20

B. 6

C. 26

D. 36

Any atom that has 20 protons is a calcium atom.

Which statement best describes what would happen if a proton were removed from a calcium atom?

A. The atom would lose electrons.

B. The atom would have a negative charge.

C. The atom would have a smaller atomic number.

D. The atom would no longer be calcium.

A row of 500 million atoms of a single type would be only about 5 centimeters (cm) long.

What occupies most of this space?

A. electron cloud

B. nuclei

C. electrons

D. empty space

Each element is made up of different atoms. The table below compares two elements.

Element 1

Element 2

Mass number

Atomic number

What do the elements in the table have in common?

A. Atoms in each element have 20 neutrons.

B. Atoms in each element have 20 protons.

C. Atoms in each element have 20 electrons.

D. Atoms in each element have 20 nuclei.

6. The

charge

of an electron is ____________.

A. positive

B. nuclear

C. neutral

D. negative

Which particle’s mass is similar to the

mass of a

proton?

A. an atom

B. a nucleus

C. a neutron

D. an electron

8. Priscilla knows that two atoms have the same number of protons.

What else can she assume about the two atoms?

A. They have the same chemical properties.

B. They have the same electric charge.

C. They have the same number of neutrons.

D. They have the same mass number.

An atom of sulfur (S) has 16 protons and 20 neutrons.

How many electrons does a

neutrally charged

atom of sulfur have?

A. 4

B. 16

C. 36

D. 20

10. The element phosphorus reacts with oxygen to produce a bright flame.

Which is the smallest particle that will also

react

with oxygen to produce a bright flame?

A. an electron in a phosphorus atom

B. a phosphorus molecule

C. a phosphorus atom

D. the nucleus of a phosphorus atom

'The Atom' Chemistry Worksheet

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