Topic 2 - The periodic table (I)

Question 1

What is an atom?

Answer 1

The smallest amount of an element that can exist.

Question 2

What is a molecule?

Answer 2

Two or more atoms joined together. (chemically bonded)

Question 3

What is the structure of an atom?

Answer 3

Nucleus, (protons + neutrons)
Electron shells (electrons)

Question 4

Where can we find a proton neutron and electron?

Answer 4

Protons and neutrons are in the nucleus and electrons are in the electron shells.

Question 5

What is the mass of a proton?

Answer 5

1

Question 6

What is the mass of a neutron?

Answer 6

1

Question 7

What is the mass of an electron?

Answer 7

1/200 or negligible

Question 8

What is the charge of a proton?

Answer 8

+1

Question 9

What is the charge of a neutron?

Answer 9

0

Question 10

What is the charge of an electron?

Answer 10

-1

Question 11

What does the term mass number indicate?

Answer 11

Total number of protons + neutrons in the nucleus

Question 12

What does the term atomic number indicate?

Answer 12

How many protons in the nucleus. (same number of protons and electrons)

Question 13

What are isotopes?

Answer 13

Atoms of the same element that have the same number of protons but different number of neutrons.

Question 14

How do you calculate the relative atomic mass?

Answer 14

Ar= (% x mass 1) + (% x mass 2) / 100