STRUCTURE OF THE ATOM

How many protons are there in an atom of aluminium?

• 27

• 13

• 14

• 17

What is the atomic number of chlorine?

• 35

• 18

• 7

• 17

What is the symbol of manganese?

• Mg

• M

• Ma

• Mn

What is the maximum number of electrons that are allowed on the second orbital?

• 9

• 7

• 8

• 3

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

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

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?

• 28

• 56

• 62

• 90

This indicates which element?

• He

• C

• O

• P

Which of the following in Fig do not represent Bohr’s model of an atom correctly?

• (i) and (ii)

• (ii) and (iii)

• (ii) and (iv)

• (i) and (iv)

Rutherford concluded that the amount of positive charge varies

• with the amount of electrons in the nucleus.

• as the the amount of isotopes varies.

• with the amount of neutrons in the nucleus.

• with different elements.