Revision Questions for Atomic Structure and the Periodic Table (pages 96-110

Question 1

Which subatomic particls has no overall charge?

Answer 1

Neutron

Question 2

Why do Atoms have no overall charge?

Answer 2

Atoms contain the same number of protons and electrons. The charges on protons and electrons are equal-sized but opposite, so the charges will cancel out

Question 3

What is represented by an atoms mass number?

Answer 3

The total number of protons, and neutrons in the atom

Question 4

What is meant by the term element?

Answer 4

A substance made up of atoms that all have the same number of protons in their nucleus

Question 5

The atoms of which element contain exactly one proton?

Answer 5

Hydrogen

Question 6

Which element is represented by the symbol Na?

Answer 6

Sodium

Question 7

True or false? An Isotope is an atom witht he same number of protons and neutrons. explain your answer

Answer 7

False. Isotopes are atoms with the same number of protons but with different numbe of neutrons

Question 8

Give the forular used to calculate the relative atomic mass Ar, of an element from its isotope abundances?

Answer 8

Relative atomic mass = sum of (sotope abundance x isotope mass number) ÷ sum of abundances of all the isotopes

Question 9

What term describes a substance with atoms of different elements held together by chemical bonds?

Answer 9

Compound

Question 10

What is the minimum number of different elements that can react to form a compound?

Answer 10

two

Question 11

What is the only way to separate a compound into its elements?

Answer 11

by using a chemical reaction

Question 12

True or false? Sodium Chloride (NaCl) is an example of a compound. Explain your answer

Answer 12

True. It contains two different elements that are held together by chemical bonds.

Question 13

How many hydrogen atoms are present in a molecule of Chloroethane, C2H5Cl?

Answer 13

Five

Question 14

What is the chemical formula for carbon monoxide?

Answer 14

CO