CHEMISTRY SABIS Grade 10 7.1 Quiz 1

When ions are formed from neutral atoms, energy may be either absorbed or released. In what case is energy absorbed?

• When forming a cation

• when gaining electron

• when adding a proton

• when making a bond with the electron

Identify the diagram that represents a positive ion.

• A

• B

• C

• D

Answer explanation

In a positive ion the number of protons is more than the electrons

How many protons does Beryllium (Be) have?

• 5

• 4

• 9

• 13

What is the atomic number of Aluminium? ?

• 13

• 14

• 27

• 17

What is the mass number of Bismuth (Bi)?

• 83

• 126

• 209

• 137

How many neutrons does Chloride ion (Cl-) have in

• 18

• 17

• 19

• 20

Know what isotopes are. Isotopes are:

• Particles within the nucleus of an atom of an element.

• Nuclei of the same element having different masses.

• Nuclei of the different elements having the same mass.

• Nuclei having the same atomic number but different mass numbers.

How many protons are in a neutral atom of chlorine?

• 17

• 18

• 19

• 20

Which statement is true about the mass distribution in an atom?

• Mass is evenly distributed.

• Mass is concentrated in the nucleus.

• Mass is concentrated in the electrons.

• Mass is evenly distributed between nucleus and electrons.

Which particle has a negligible mass?

• Proton

• Neutron

• Electron

• Nucleus