chapter 8 (atoms and molecules) secondary 1

Question 1

What consists of a atom?

Answer 1

1. Protons
2. Neutrons
3. Electrons

Question 2

What is the charge of a proton, neutron and a electron?

Answer 2

+1, 0. 1- respectively.

Question 3

What consists of the nucleus of an atom?

Answer 3

The protons and the neutrons.

Question 4

What is the relative mass of a proton, neutron and an electron?

Answer 4

1, 1, 1/1840 respectively.

Question 5

Where are the electrons placed in an atom?

Answer 5

Around the nucleus of the atom.

Question 6

Are protons equal to the number of electrons? If yes, why are the positive and negative charges in the atom balanced?

Answer 6

Yes.
The charge of a proton is +1
The charge of a electron is 1-
-1+1 = 0

Question 7

On the element symbol, which is the proton number/atomic number?

Answer 7

It is the smaller number. / The number above the element symbol.

Question 8

How do we find the number on neutrons in an element|?

Answer 8

Take the atomic mass - atomic number.

Question 9

Which is the group and period in the periodic table?

Answer 9

Group is horizontal, period is vertical.

Question 10

What is a molecule?

Answer 10

two or more atoms of the same element or a different element that are chemically combined.

Question 11

What is an ion?

Answer 11

It is a positively or negatively charged atom or molecule.