Question

1.* Write the name and symbol of the ion formed when

a. a sulfur atom gains two electrons.
b. an aluminum atom loses three electrons.
c. a nitrogen atom gains three electrons.
d. a calcium atom loses two electrons.
2 * Write electron configurations for the 2 + 2 plus cations of these elements.

Fe
Co
Ni
3. Write electron configurations for the 3 + 3 plus cations of these elements.

chromium
manganese
iron
4. Write the symbol for the ion formed when each element gains electrons and attains a noble-gas electron configuration.

Br
H
As
Se

Answer 1

1a) anion and S-2
1b) cation and Al+3
1c) anion and N-3
1d) cation and Ca+2

Answer 2

Step-by-step explanation:

1.

a. When a sulphur atom gains two electrons, it becomes negatively charged to form an anion called sulphide ion and it’s represented as S2-.

b. When an aluminium atom loses three electrons, it becomes positively charged to form a cation and it is represented as Al3+.

c. When a nitrogen atom gains three electrons, it becomes negatively charged to form an anion called nitride ion and it is represented as N3-.

d. When a calcium atom loses two electrons, it becomes positively charged to form a cation and it is represented as Ca2+

2.

• When Iron (Fe) loses two electrons, it becomes Fe2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d6

• When Cobalt (Co) loses two electrons, it becomes Co2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d7

• When Nickel (Ni) loses two electrons, it becomes Ni2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d8

3.

•When Chromium (Cr) loses three electrons, it becomes Cr3+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d3

• When Manganese (Mn) loses three electrons, it becomes Mn3+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d4

4.

•Bromine (Br) gains an electron to become Br-

•Hydrogen (H) gains an electron to become H-

•Arsenic (As) gains three electrons to become As3-

•Selenium (Se) gains two electrons to become Se2-