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Flashcards in Atomic structure Deck (70)
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1

What is a chemical element?

Substance composed of only one type of atom

2

What is a chemical symbol?

Letter or two letters assigned to every known type of atom

3

Define atom

Basis of Chem
Basis of everything in universe

4

Matter composed of what?

Atoms

5

Are there pieces of matter smaller than atoms?

Yes, neutrons, protons, electrons

6

Are there pieces of matter smaller than neutrons, protons, electrons?

Yes, nucleons, quarks

7

Relative charge of a proton?

Positive one

8

Relative mass of a proton?

1

9

Position of a proton?

Nucleus

10

Symbol for proton?

P, P+, N+

11

Relative charge of a neutron?

0

12

Relative mass of a neutron?

1

13

Position of neutron?

Nucleus

14

Symbol for neutron?

N, N0

15

Relative charge for electron

-1

16

Relative mass of electron?

approx 1/2000

17

Position of electron?

cloud

18

Symbol for electron?

e−, β−

19

Describe nucleus structure

Composed of protons and neutrons

20

How do you know what the charge of the nucleus is?

Charge=number of protons

21

How small is nucleus?

Extremely small compared to atom.
Diameter average is 10 to power -15, compared to the average atomic diameter of 10 to power of -10

22

How many times larger than nucleus is the atom?

100,000
Diameter average is 10 to power -15, compared to the average atomic diameter of 10 to power of -10

23

How much of mass of atom is nucleus?

99.9%
Due to relatively large masses of protons and neutrons compared to mass of electrons.

24

How dense is nucleus?

Very dense
Due to large mass and small volume

25

Describe electron arrangement of electrons around nucleus

Move in relatively large space, often called electron cloud, outside nucleus
As negatively charged, kept moving around nucleus by attractive electrostatic forces, between them and +vly charged nucleus.
In unchanged atom, number of protons = number of electrons.

26

Define atomic number

Number of protons in nucleus

27

Define atomic mass

Number of protons and neutrons

28

Shell 1 is

lowest energy level
Found closest to nucleus

29

As shell number increases

so does amount of energy electrons contain

30

What is max number of electrons in each shell?

2n squared
n= shell number