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Flashcards in Atoms and Ions Deck (25)
1

What are atoms composed of?

A nucleus surrounded by electrons. The nucleus is made up of protons and neutrons

2

What does the mass number represent?

Number of protons plus number of neutrons

3

What does the atomic number represent?

Number of protons (number of protons and electrons are the same)

4

Why is the number of electrons ignored?

Because they're tiny

5

What is an isotope?

An atom of the same element with a different number of neutrons

6

What is the relative atomic mass?

The weighted average mass of all the isotopes of an element

7

What is the formula of relative atomic mass?

SUM(Isotope mass x isotope abundance) / 100

8

What is the relative mass and the relative charge of a proton?

1 and +1

9

What is the relative mass and the relative charge of an electron?

1/2000 and -1

10

What is the relative mass and the relative charge of a neutron?

1 and 0

11

What is an electron?

Negatively charged particles

12

Why are electrons important?

Because they take part in bonding

13

What does the number of electrons in the outer shell show?

Which group in the periodic table

14

What are group 8 elements in the periodic table?

Stable atoms, therefore very unreactive

15

Give an example of a diatomic molecule

Oxygen (O2)

16

Why do ions form?

To gain or lose the electrons they need to become stable

17

What happens when a metal bonds to a non metal?

Electrons are transferred from the metal atoms to the non metal atoms. The metal ions have an overall positive charge

18

What do ions have the same electronic structure as?

The nearest noble gas

19

Why do group 1 metals have a charge of +1?

Because they have one outer electron to lose

20

What is the ion for hydroxide?

OH-

21

What is the ion for nitrate?

NO3-

22

What is the ion for sulphate?

(SO4)2-

23

What is the ion for carbonate?

(CO3)2-

24

How is the formula for a compound worked out?

Total positive charge must equal the total negative charge.

25

Example: what is the formula of magnesium chloride?

MgCl2