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Structure of atoms

Authored by Jeevardhani Ayurveda

Science

9th Grade

Structure of atoms
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10 questions

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1.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is the shape of atom?

square

circle

sphare

triangle

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following correctly represents the electronic distribution in the Mg atom?

3, 8, 1

2, 8, 2

2, 8, 2

2, 8, 2

3.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of?

electron

proton

nucleus in the atom

atomic mass

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

13

10

14

16

5.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

The first model of an atom was given by?

N. Bohr

E. Goldstein

Rutherford

J.J. Thomson

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An atom with 3 protons and 4 neutrons will have a valency of?

3

7

1

5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Hydrogen exists in three isotopic forms, 11H, 21H, 31H known as protium, deuterium and tritium. Why are all the isotopes neutral in nature?

Since neutrons are neutral in nature hence isotopes are electrically neutral.

All the isotopes have one electron and one proton, hence they are neutral.

All the isotopes have one proton and one neutron, hence they are neutral

Increasing number of protons in the isotopes make them neutral.

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