Topic C1- Atomic Structure And The Periodic Table

Question 1

What charge do protons have?

Answer 1

+1

Question 2

What charge do neutrons have?

Answer 2

0

Question 3

What charge do electrons have?

Answer 3

-1

Question 4

What is the relative mass of a proton?

Answer 4

1

Question 5

What is the relative mass of a neutron?

Answer 5

1

Question 6

What is the relative mass of an electron?

Answer 6

Very small

Question 7

What is the radius of an atom

Answer 7

0.1 nm /1x10^-10m

Question 8

What is the radius of a nucleus?

Answer 8

1x10^-14

Question 9

What charge do atoms have?

Answer 9

Atoms have no overall charge
Number of protons =number of electrons

Question 10

What is the mass number?

Answer 10

Mass number =total number of protons and neutrons in an atom

Question 11

What is an atomic number?

Answer 11

Atomic number = number of protons in an atom

Question 12

What are elements?

Answer 12

Elements are substances made up of atoms with the same atomic number

Question 13

What are isotopes of an element?

Answer 13

Isotopes are elements with the same number if protons but different number of neutrons

Question 14

What is relative atomic mass?

Answer 14

The average mass number for an element

Question 15

What is the formula for relative atomic mass (Ar)?

Answer 15

Ar = (sum of isotopes abundance X isotopes mass numbers)
————————————————————————————-
total abundance of all isotopes

Question 16

How many elements are there?

Answer 16

100

Question 17

What is a compound?

Answer 17

A substance formed from two or more elements chemically bonded together in fixed proportions