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Flashcards in Quiz 1 Deck (77)
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0

Who discovered the electron? When?

JJ Thomas, 1897

1

What is matter?

Any substance that has mass and takes up space

2

What is an element?

The base units that all matter is made up of

3

How many elements are there?

109

4

What is an atom?

The smallest single unit of an element that retains that element's characteristics

5

What is a compound?

A substance that is comprised of two or more atoms; which are chemically combined.

6

What is a molecule?

The smallest single unit of a compound that retains that compounds characteristics.

7

What three subatomic parts are atoms made up of?

Protons, neutrons, electrons.

8

What charge do electrons have and where are they located?

Orbiting the nucleus, negative charge.

9

Where are protons located and what charge do they have?

Located in the nucleus and are positively charged

10

Where are neutrons located and what charge do they have?

Located in the nucleus, neutral charge.

11

What is the difference between each element?

The number of protons they have

12

What gives the atomic number and characteristics of an element?

The number of protons it has

13

How many electrons can fit in the first shell about the nucleus?

2 electrons

14

How many electrons can fit in the second shell around the nucleus?

Eight electrons

15

How many electrons can fit in the third shell about the nucleus?

18 electrons

16

How many electrons can fit in the fourth shell about the nucleus?

18 electrons

17

What can be said about an atom that had the same number of protons and electrons?

It is balanced

18

When is an atom said to be stable?

When it will not readily react with another element

19

How is the stability of an element determined?

The number of electrons in the outermost shell.

20

If an atom has a positive charge, what is it known as?

Positive ion

21

If an atom has a negative charge what is it known as?

A negative ion

22

What is electricity?

The flow, or transfer of electrons.

23

What are the two types of electricity?

Current electricity, static electricity

24

What is conventional flow?

The orientation of electrons flowing from the positive to the negative

25

What is electron flow?

The orientation of electrons flowing from the negative to the positive

26

Which is the proper theory for electricity?

Electron flow

27

what is a conductor?

An element which will easily give up and receive electrons

28

What is an insulator?

An element which will not easily give up and receive electrons

29

What will the shell of an insulator look like?

The outer shell will be almost completely full