Electron Configuration and periodic trends Which element has the following groun

Question

Electron Configuration and periodic trends Which element has the following ground-state electron configuration? A) Sn B) Sb C) Pb D) Bi E) Te Arrange the following ions in order of decreasing ionic radius: Al^3+, Mg^2+, Na^+, O^2-. decreasing radius rightarrow A) Al^3+ > Mg^2+ > O^2- > Na^+ B) Al^3+ > Mg^2+ > Na^+ > O^2- C) Na^+ > Mg^2+ > Al^3+ > O^2- D) O^2- > Al^3+ > Mg^2+ > Na^+ E) O^2- > Na^+ > Mg^2+ > Al^3+ Lewis structure and VSEPR theory According to the VSEPR approach, the electron-pair geometry around the ozone, O atom in ozone, O_3, is A. linear B. trigonal planar C. tetrahedral D. bent E. trigonal bipyramidal

Explanation / Answer

3)

Total number of electrons = 2+2+6+2+6+2+10+6+2+10+3 = 51

This will also be atomic number of atom

Atomic number 51 is for Antimony (Sb)

Answer: B

4)

All have same number of electrons which is 10 electrons

So, greater the number of proton , smaller will be size

number of proton order is : Al > Mg > Na> O

So, order of Size is:

02->Na+>Mg2+>Al3+

Answer: E

i am allowed to answer only 1 question at a time

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