Central Atoms

   1) Which atom(s) could be the central atom, X, in the stable molecule XH₃ with one lone pair of electrons?

(a) B

(b) C

(c) N

(d) P

(e) S

 

   2) Which atom(s) could be the central atom, X, in the stable molecule XF₂ with two lone pairs of electrons?

(a) Cl

(b) O

(c) Se 

(d) Si

(e) Xe

 

   3) Which atom(s) could be the central atom, X, in the stable molecule XO₃ with no lone pairs?

(a) Al

(b) C

(c) Cl

(d) P

(e) S

 

   4) Which atom(s) could be the central atom, X, in the stable molecule XF₄ with one lone pair of electrons?

(a) C

(b) I

(c) N

(d) S

(e) Xe

 

   5) Which atom(s) could be the central atom, X, in the stable molecule XCl₅ with no lone pairs?

(a) As

(b) Br

(c) C

(d) P

(e) Xe

 

   6) Which atom(s) could be the central atom, X, in the stable molecule XCl₄ with no lone pairs?

(a) B

(b) Br

(c) C

(d) Te

(e) Xe

 

   7) Which atom(s) could be the central atom, X, in the stable molecule XF₃ with two lone pairs?

(a) B

(b) Br

(c) Cl

(d) N

(e) P

 

    8) Which atom(s) could be the central atom, X, in the stable molecule XH₂ with two lone pairs?

(a) Si

(b) C

(c) N

(d) S

(e) O