7.1 Elements Flashcards Preview

Year 8 Science Exam Semester 2 > 7.1 Elements > Flashcards

Flashcards in 7.1 Elements Deck (23):
1

What are elements?

Substances that are made up of just one type of atom
Air is mostly made up of oxygen and nitrogen

2

What are metallic properties?

They tend to be shiny
Are solid at room temperature (except mercury)
Are good conductors of heat and electricity
Can be stretched into wires (ductile)
Can be hammered or bent into sheets (are malleable)

3

What are some non-metallic elements?

They tend to be dull
Do not conduct heat or electricity
Break or crumble when bent (brittle)

4

How many known elements are there?

118

5

How many elements naturally occur?

91

6

What does each element have that is unique?

A name and chemical symbol

7

What order does the periodic table list the elements in?

Lightest to heaviest

8

How many letters is the chemical symbol made up of?

1, 2 or 3

9

What is always a capital letter?

The first letter of the chemical symbol

10

What does monatomic mean?

Made up of single atom

11

What are molecules

Clusters of atoms molecules

12

What are lattices?

Large grid-like structures

13

What are some physical properties of atoms?

Solid, liquid or gas
Melting and boiling Point
How well it conducts heat and electricity
If it can bend or if it breaks when a force is applied

14

What are monatomic elements?

An element that consists of just single atoms

15

Are monatomic elements common?

No they are rare, only 9/92 are naturally occurring elements

16

What are most non-metallic elements made up of?

Molecules

17

In a molecular elements, are all molecules identical in size, shape, number and types of atoms?

Yes

18

What percentage of known elements are metals?

80%

19

Do atoms in metals form lattices?

Yes, they don't form molecules, instead they form lattices

20

What makes atoms strong at room temperature?

The structure

21

Can atoms move over each other in lattices

Yes and it doesn't break the lattices

22

Are there any non-metallic lattices?

Yes only a few though

23

In a non-metallic lattice, are the atoms in a fixed position?

Yes and they are bound tightly to each other