Write the valence shell electronic configuration of an element present in the 3rd period and Group IIIA,

The group III-A is called the boron family. The general last shell electronic configuration for the group III-A elements is given as: ns2np1 . The valence shell accommodated three electrons in it.

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ElementAtomic numberValence shell configuration

In495s24d105p1

Tl816s24f145d106p1

Explanation:

Hope it helps ya ItzAlex

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Al= [Ar] 3s^2 3p^1

for the third period the principal quantum number is n=3. the third

not clear

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6