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Chemical bond & Valency

Authored by Vijayasanthi M

Chemistry

8th Grade

Used 82+ times

Chemical bond & Valency
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many electrons are there in the valence shell of the O2– ion?

2

8

10

6

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An atom that loses or gains electrons is called a(n)

isotope.

proton.

neutron.

ion.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula of the compound formed between magnesium and oxygen?

MgO

Mg2O2

MgO2

Mg2O

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which one of the following elements has valence electrons in the n = 3 shell?

Beryllium

Silicon

Hydrogen

Neon

5.

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

1, 8, 3

8, 2, 2

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An element has 3 valence electrons in its outermost 3rd shell. The name of the element is ____________.

B

Al

Ga

In

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A symbol represents ____________

one molecule of an element.

one ion of an element.

one atom of an element.

atomic number of an element.

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