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

Aa sulfur atom gains two electrons.
Ban aluminum atom loses three electrons.
Ca nitrogen atom gains three electrons.
Da calcium atom loses two electrons.

2 Write electron configurations for the 2 + 2 plus cations of these elements.


Fe

Co

Ni

  1. Write electron configurations for the 3 + 3 plus cations of these elements.

chromium

manganese

iron

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

Br

H

As

Se

Verified Answer :

pchaps

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

ysabayomi

Answer:

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-