ICSE class 8 structure of atom

What number indicates the nucleus?

• 1
• 2
• 3
• 4

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons

• Nucleus, positive
• Nucleus, negative
• Nucleus, neutral
• Electron Cloud, positive

What is the atomic number of chlorine?

• 35

• 18

• 7

• 17

How many protons are there in an atom of aluminium?

• 27

• 13

• 14

• 17

What is the symbol of manganese?

• Mg

• M

• Ma

• Mn

What are valence electrons?

• electrons on the first orbital always
• nucleus
• the outermost shell
• the number of electrons on the outermost orbital

Oxygen’s atomic number is 8. This means that an oxygen atom must have

• 8 electrons
• 8 protons
• 8 neutrons
• a mass number of 8

99.9% of the atom's mass is found where?

• nucleus

• protons

• electron cloud

• neutrons