Question

Use the word list to answer the following questions.

a. How many energy levels are occupied for arsenic atoms?  Answer: four, one, two, three, five, six, seven, eight

b. How many energy levels are occupied for phosphorous atoms?  Answer: three, one, two, four, five, six, seven eight

c. How many energy levels are occupied for antimony atoms?  Answerfiveonetwofourthreesixseveneight

d. How many valence electrons does calcium have? Answer: two, one, three, four, five, six, seven, eight

e. How many valence electrons does chlorine have?  Answer: seven, one, two, four, five, six, three, eight

f. How many valence electrons does hydrogen have?

g. Name an element with chemical properties similar to oxygen.

Answer 1

Occupied energy level is equal to its valance electron's principal quantum number.

Principal quantum number = the period of that element in periodic table.

A.

Arsenic atom. Period =4

Answer is four.

B.

Phosphorus atom

Period = 3

Answer = three

C.

Antimony

Period = 5

Answer is five

D.

Calcium is second group element.

So it have 2 valance electrons.

Answer is two

E.

Chlorine is group 7 element(transition elements are not included in counting of group )

So it has seven valance electrons.

F.

Hydrogen is first group element. So it has one valance eletron.

G.

Same group elements show chemical similarities. Sulphur belongs to the same group as that of oxygen.

So Sulphur is an answer