C1.1 Flashcards

1
Q

Why is oxygen an element?

A

Because it only contains oxygen atoms

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2
Q

What are protons, neutrons and electrons called?

A

Subatomic particles

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3
Q

How can you work out how many of each type of subatomic particle and atom has?

A

From its atomic number and mass number

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4
Q

What is the atomic number?

A

The number of protons in an atom of an element

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5
Q

Why do atoms have no overall charge?

A

Because the number of electrons in an atom is the same as the number of protons

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6
Q

What is the mass number?

A

The total number of protons and neutrons in an atom

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7
Q

What are energy levels also known as?

A

Shells

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8
Q

What’s size shell has the lowest energy level?

A

The inner most (closest to the middle)

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9
Q

What size shells has the highest energy level?

A

Outer shell

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10
Q

How many electrons can the first energy level (shell) have?

A

1 or 2

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11
Q

How many electrons can the second energy level have?

A

Up to 8

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12
Q

How many electrons can the third energy level have?

A

Up to 8

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13
Q

How many electrons can the fourth energy level have?

A

1 or 2

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14
Q

What do atoms in a group in the periodic table have in common?

A

The have the same highest energy level (outer shell)

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15
Q

What group is alkali metals?

A

Group 1

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16
Q

What is group 0 called?

A

Noble gases

17
Q

What is different about group 0 regarding the energy levels (shells)?

A

The highest occupied energy level (outer shell) of their atoms are full

18
Q

What happens when elements react with each other?

A

Their atoms join together to form compounds

19
Q

How do you form ions?

A

Metals and non-metals react together to form compounds, the compounds are made of ions.

20
Q

What do compounds formed from reactions between non-metals consist of?

A

Molecules

21
Q

What do you use to represent chemical reactions?

A

Word equations and balanced symbol equations

22
Q

What are reactants?

A

The substances that react together

23
Q

What are products?

A

The substances made

24
Q

In a correctly balanced symbol equation…….

A

There are the same number of atoms of each of each element in the reactants and in the products

25
Q

What are all substances made of?

A

Atoms