Atomic Structure and Periodic Table

Question 1

What are isotopes?

Answer 1

Atoms with the same number of protons (and electrons) but different numbers of neutrons.
Isotopes have the same chemical and physical properties as one another.

Question 2

What is the relative atomic mass?

Answer 2

It is the atomic weight on the periodic table. It is the weighted average mass of all the mass numbers of the isotopes of an element.

Question 3

How did Mendeleev organise his elements?

Answer 3

He ordered it according to:
Relative atomic mass
Properties

Question 4

Why did Mendeleev leave gaps in the table?

Answer 4

He realised that he had to leave gaps in the table in order to keep the similar properties together. These gaps were left for elements which were not discovered yet.

Question 5

How do you know how many neutrons there are in an element?

Answer 5

Subtract the atomic(proton) number from the relative atomic mass.

Question 6

What is the relative charge of a proton?

Answer 6

+1

Question 7

What is the relative charge of an electron?

Answer 7

-1

Question 8

What is the relative charge of a neutron?

Answer 8

0

Question 9

What is the relative mass of a proton?

Answer 9

1

Question 10

What is the relative mass of an electron?

Answer 10

1/2000 (close to 0)

Question 11

What is the relative mass of a neutron?

Answer 11

1

Question 12

What is an ion?

Answer 12

An electrically charged particle formed when an atom or molecule gains or loses electrons.

Question 13

What is an ionic compound?

Answer 13

An ionic compound occurs when a negative ion (an atom that has gained an electron) joins with a positive ion (an atom that has lost an electron).

Question 14

What is an ionic lattice?

Answer 14

The regular arrangement of ions in an ionic substance.

Question 15

Positive ions are also called…

Answer 15

….cations

Question 16

Negative ions are also called…

Answer 16

….anions

Question 17

Positive ions are formed when an atom gains or loses an electron?

Answer 17

Loses

Question 18

Negative ions are formed when an atom gains or losses an electron?

Answer 18

Gains

Question 19

If an atom loses 1 electron, the metal ion would have a charge of…..

Answer 19

….+1

Question 20

If an atom gains 1 electron, the metal ion would have a charge of…

Answer 20

….-1

Question 21

Do Ionic compounds have a low or high melting point?

Answer 21

They have a high melting and boiling point due to the strong electrostatic forces of attraction.

Question 22

A substance can conduct electricity when..

Answer 22

.It contains charged particles, such as ions, and
. These particles are free to move from place to place

Question 23

An ionic compound can conduct electricity when….

Answer 23

. It has been melted to form a liquid or
. It has dissolved in water to form an aqueous (aq) solution.

Question 24

If ionic compounds are solid, do they conduct or insulate?

Answer 24

Insulate

Question 25

What are ionic compounds made up of?

Answer 25

They are made up of metals and non-metals.