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Atom

Authored by Roshini Pimmachcharige

Science, Physics, Chemistry

10th Grade - University

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35 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The atomic mass unit is defined as:

the mass of the hydrogen atom containing only one proton.

the mass of electrons found in a carbon atom containing six protons and neutrons.

1/12 the mass of a carbon atom containing six protons and six neutrons.

1/14 the mass of a nitrogen atom containing 7 protons and 7 neutrons.

none of the above

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How many protons does Potassium (K) have?

19

39

20

58

18

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

All of the positive charge of an atom is concentrated in the nucleus.

True

False

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The atom is the fundamental building block of everything we hear, feel, see, and experience.

True

False

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The nucleus of an atom is a very small, dense region that contains over 99.9% of the atomic mass.

True

False

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The mass of a proton is exactly the same as the mass of a neutron.

True

False

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The charges on electrons and neutrons cancel each other to give neutral atoms.

True

False

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