Lesson 3: Atoms and elements

Question 1

What is an atom?

Answer 1

All matter is made up of atoms

Question 2

Are atoms the smallest units of matter?

Answer 2

No, Atoms of themselves are made of smaller particles

Question 3

What is the middle part of the atom called?

Answer 3

The Nucleus

Question 4

What are atoms made of?

Answer 4

Protons, Neutrons, Electrons

Question 5

What are protons?

Answer 5

Positively charged particles found inside the nucleus

Question 6

What are neutrons?

Answer 6

Neutral particles found inside the nucleus

Question 7

What are electrons?

Answer 7

Negatively charged particles that orbit the nucleus

Question 8

Where is the majority of the mass of the atom?

Answer 8

in the nucleus where the protons and neutrons are

Question 9

Define: Atomic number

Answer 9

This is the number of protons inside the nucleus of an atom (it’s the number that’s above the elemental symbol)

Question 10

Define: Mass number

Answer 10

This is the number of protons +neutrons in the nucleus of an atom (its the number below the elemental symbol)

Question 11

Mass number = ???

Answer 11

Total number of protons and neutrons

Question 12

Atomic number = ???

Answer 12

Number of protons (also electrons)

Question 13

What is bigger, mass number or atomic number?

Answer 13

Mass number is always bigger than the atomic number

Question 14

Number of electrons = ???

Answer 14

The number of protons

Question 15

Is the number of protons + or -

Answer 15

positive

Question 16

are the number of electrons + or -

Answer 16

The number of electrons is negative

Question 17

State the 3 particles that make up the atoms

Answer 17

Protons, neutrons, electrons