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Flashcards in Atomic Structure Deck (13):
1

Importance of atomic structure

Almost all the properties of matter depend on the atomic structure

Knowledge of atomic structure will help you understand why substances behave as they do

2

Earliest concepts of the atom

Not based on experimental evidence

3

Atom

Smallest particles of an element that retains its identity in a chemical reaction

4

John daltons theory

1. All matter is made up of very small, discrete particles called atoms
2. All atoms of an element are alike in weight and different the weight of any other atom
3. Atoms cannot be subdivided, created, or destroyed
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds
5. In chemical reactions atoms are combined, separated, or rearranged

5

Electron

Negative
Outside nucleus (electron cloud)
Mass-1/1837

6

Proton

Positive
Nucleus
Mass-1

7

Neutron

Neutral
Nucleus
Mass-1

8

Quark flavors

Up
Down
Top
Bottom
Strange
Charm

9

Atomic mass

The sum of the number of protons and neutrons in the nucleus of an atoms

10

Isotopes

All have the same Atomic number

11

Atomic number

Number of protons

12

Number of protons is equal to

Number of electrons

13

Average atomic mass

A weighted average