An atom usually contains three main particles. Complete the following table. No Name of the particles Kind of charge each carries 1 2 3

An atom usually contains the following three main particles. No Name of the particles Kind of charge each carries 1 Electron negative charge An atom is made up of electrons. No Name of the particles Kind of charge each carries 2 Proton positive charge An atom is made up of protons. No Name of the particles Kind of charge each carries 3 Neutron neutral charge An atom is made up of neutrons. No Name of the particles Kind of charge each carries 1 Electron negative charge 2 Proton positive charge 3 Neutron neutral charge

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table. Particle Protons Neutrons Electrons A 3 4 2 B 9 10 10 C 17 18 17 D 17 20 17 Choose from the table, which particles represent a cation, an anion, a pair of isotope.

Particle A is a cation because it contains more number of protons than electrons which means that the positive charge will increase, so it is called a cation. In a neutral atom number of protons will be equal to number of electrons. Particle B is an anion because it contains more number of electrons than protons which means that the negative charge will increase, so it is called an anion. In a neutral atom number of protons will be equal to number of electrons. Particles C and D are isotopes these particles are having same atomic number with different mass numbers that means they differ in the neutron number.

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table Particle Protons Neutrons Electrons A 3 4 2 B 9 10 10 C 17 18 17 D 17 20 17 Write the chemical formula of the compound that would be formed between C and hydrogen.

The compound formed between C and hydrogen is hydrochloric acid and the chemical formula is HCl . Here particle C is chlorine it will react with hydrogen the resultant compound is HCl with the covalent bond.

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table Particle Protons Neutrons Electrons A 3 4 2 B 9 10 10 C 17 18 17 D 17 20 17 What will be the formula of compound formed by A and B only?

The particle A is lithium and the particle B is fluorine and the compound formed by A and B is lithium fluoride. The chemical formula of this compound is LiF . The bond formed between lithium and fluorine is ionic bond.

Number of protons and number of neutrons of an atom form its

EASY

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q B

Atomic number is the number of _____ present in the nucleus of an atom.

EASY

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q B

_____ is the combining capacity of atom with other atoms to form a molecule or a compound.

EASY

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

An atom usually contains three main particles. Complete the following table.

No	Name of the particles	Kind of charge each carries
1
2
3

HARD

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

A, B, C and D are elements whose atomic numbers are given below. Write down the electronic configuration for each one of these element

No.	Element	At. No.	ElectronicConfiguration
1.	A	16
2.	B	19
3.	C	18
4.	D	13

HARD

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table.

Particle	Protons	Neutrons	Electrons
A	3	4	2
B	9	10	10
C	17	18	17
D	17	20	17

Choose from the table, which particles represent a cation, an anion, a pair of isotope.

EASY

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table

Particle	Protons	Neutrons	Electrons
A	3	4	2
B	9	10	10
C	17	18	17
D	17	20	17

Write the chemical formula of the compound that would be formed between C and hydrogen.

HARD

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table

Particle	Protons	Neutrons	Electrons
A	3	4	2
B	9	10	10
C	17	18	17
D	17	20	17

What will be the formula of compound formed by A and B only?

MEDIUM

8th ICSE

IMPORTANT

Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q C

Chlorine is an element with atomic number 17. It has two isotopes having mass numbers 35 and 37.

What is meant by the term atomic number?

Number of protons and number of neutrons of an atom form its .

Important Questions on Atomic Structure

Learn and Prepare for any exam you want !