Chemistry
State the number of neutrons in each of the atoms A to E. Also state which of the atoms A to E is a metal.
Atomic Structure
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Answer
Number of neutrons [n] = Mass number [A] – Atomic number [Z]
A → n = 1 – 1 = 0
B → n = 16 – 8 = 8
C → n = 14 – 7 = 7
D → n = 23 – 11 = 12
E → n = 35 – 17 = 18
D is a metal as it has the electronic configuration [2, 8, 1] and will give one electron to attain a stable octet.
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Name or state the following.
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- Two elements having same number of protons and electrons but different number of neutrons.
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Match the elements A to E in List 1 with their valencies in List 2 and with their nature in List 3.
List 1
[Elements]List 2
[Valency]List 3 A: At. no. 7, Mass no.14 1. -3 X: Metal B: Elec. config. 2,8 2. +1 Y: Non-metal C: Neutrons 14, electrons 13 3. +3 Z: Noble gas D: Neutrons 22, protons 18 4. +2 E: Elec. config. 2,8,1 5. 0