AMI welcomes 1D back to Term 3!

What makes up the nucleus of an atom?

• proton and electron

• proton and neutron

• electron and neutron

• proton, electron and neutron

The mass of an atom is largely determined by the number of protons and neutrons.

• True

• False

Isotopes are atoms of the same element with ......

• the same number of neutrons but different number of protons

• the same number of protons but different number of electrons

• the same number of protons but different number of neutrons

• the same number of electrons but different number of neutrons

Element Y is represented by the symbol ²³₁₁Y

Select ALL statements that are true about an atom of element Y.

• An atom of Y has 11 protons.

• An atom of Y has 12 protons.

• An atom of Y has 12 neutrons.

• An atom of Y has 11 electrons.

Answer explanation

The larger number, 23 is the nucleon number = number of protons + neutrons.

The smaller number, 11 is the proton number.

Number of protons = 11

Number of electrons = 11

Number of neutrons = 23 - 11 = 12

What will be the electronic configuration of this atom?

¹⁴₇Z

• 7

• 14

• 2,5

• 2,8,4

What is the maximum number of electrons in the second electron shell of an atom?

• 2

• 8

• 18

Which group does an element of an electronic configuration of 2,8,4 belongs to?

• Group 2

• Group 13

• Group 14

• Group 15

Answer explanation

The Group number tells us the number of valence electrons of an atom.

If it is in Group 14, the atom has 4 valence electrons.

What part of an atom is involved in chemical bonding?

• proton

• neutron

• electron

When an atom loses an electron, it becomes a _________.

• noble gas

• anion

• cation

Answer explanation

When an atom loses an electron, it becomes a positive ion (cation).

When an atom gains an electron, it becomes a negative ion (anion).

An atom cannot lose or gain electrons to become a noble gas.

Which pair of elements forms an ionic bond?

• Magnesium and Oxygen

• Magnesium and Sodium

• Iron and Zinc

• Nitrogen and Hydrogen

Answer explanation

An ionic bond forms between a metal and non-metal.