Question

Specify the group of the periodic table in which each of the following elements is found:...

Specify the group of the periodic table in which each of the following elements is found: (example, Group 6, Group 12, halogens, alkaline earth metals, etc).

a) [Ne] 3s1

b) [He] 2s2 2p1

c)[Ar] 3d5 4s2

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Answer #1

a) group 1 alkali metal sodium (Na)

* Atomic number of sodium is11

* Electronic configuration of sodium is 1s2 2s2 2p6 3s1

* Here Ne (noble gas) atomic number is 10, so neon completely filled in s and p orbitals. Now consider [Ne] is 10 electrons filled.

b) group 13 boron family (III A group)

* Atomic number of boron is 5

* Electronic configuration of boron is 1s2 2s2 2p1

* Here note (He) helium atomic number is 2

* Helium completely filled in 1s orbital. Now consider the [He] is 2 electrons filled.

c) group 7 (VIIB) d block element Manganese

* Atomic number of manganese is 25

* Electronic configuration of manganese is [Ar] 3d5 4s2

* Argon atomic number is 18

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