The mass number of an atom of 128Xe is ________. A) 54 B) 182 ...

[altibaby]

The mass number of an atom of 128Xe is ________.
 
  A) 54
  B) 182
  C) 74
  D) 128
  E) 120

Question 2

The solid compound, Na4SiO4, contains
 
  A) Na+, Si4+, and O2- ions.
  B) Na+ and SiO44- ions.
  C) Na4+ and SiO44- ions.
  D) Na4SiO4 molecules.

Question 3

Which reaction below represents the second electron affinity of S?
 
  A) S(g) + e  S(g)
  B) S(g) + e  S2(g)
  C) S(g)  S(g) + e
  D) S(g)  S(g) + e
  E) S2(g)  S(g) + e

Question 4

The mass of a proton is 1.67  10-27 kg. What is the mass of a proton in picograms?
 
  A) 1.67  10-18 pg
  B) 1.67  10-15 pg
  C) 1.67  10-12 pg
  D) 1.67  10-9 pg

[s.meritte]

Answer to Question 1

D

Answer to Question 2

B

Answer to Question 3

B

Answer to Question 4

C

[altibaby]

Gracias!

[isabelt_18]

Great answer, keep it coming