Homework Practice

Printable assignment

Atomic Data: Number, Mass, Isotopes and Symbols

Section A: Atomic Number and Mass Number

Question 1mcq

Atomic number equals number of:

A.Protons + neutrons

B.Protons

C.Neutrons only

D.Electrons + neutrons always

Question 2mcq

Mass number equals:

A.Protons + neutrons

B.Only protons

C.Only shells

D.Only electrons

Question 3mcq

An atom has atomic number 6 and mass number 12. Number of neutrons is:

A.12

B.0

C.18

D.6

Question 4mcq

A neutral atom of sodium has atomic number 11. It has electrons:

A.12

B.10

C.11

D.22

Question 5mcq

An atom has 17 protons and 18 neutrons. Its mass number is:

A.18

B.35

C.17

D.1

Question 6mcq

If two atoms have different atomic numbers, they are:

A.Different elements

B.Isotopes always

C.Same atom

D.Same element always

Section B: Isotopes, Isobars and Symbols

Question 7mcq

Isotopes have same atomic number but different:

A.Chemical symbol always

B.Number of protons

C.Element identity

D.Mass number

Question 8mcq

^{35}Cl

and

^{37}Cl

are:

A.Isobars

B.Ions only

C.Isotopes

D.Different elements with same mass

Question 9mcq

Isobars have same:

A.Atomic number

B.Mass number

C.Chemical properties always

D.Number of protons always

Question 10mcq

The symbol for sodium is:

A.Na

B.Sd

C.S

D.So

Question 11mcq

The symbol for potassium is:

A.P

B.Pt

C.Po

D.K

Question 12mcq

Which matched pair is correct for chemical symbols Focus on: Calcium — Ca.?

A.Carbon — Ca

B.Argon — Ag

C.Calcium — Ca

D.Chlorine — C