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Flashcards in atoms / elements Deck (37)
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1

metals

shiny substances that conduct electricity

2

has little to no mass

electrons

3

right of the staircase on periodic table

nonmetals

4

mass =

protons + neutrons

5

protons

positively charged found in the nucleus

6

electrons

negatively charged surround the nucleus

7

smallest unit of matter that still retains its original properties

atom

8

3rd shell

8 electrons can hold up to 18 but is "full" at 8

9

radiation

release of energy

10

allows the isotope to assume a more stable form

radioactive decay

11

atomic mass - atomic number =

number of neutrons

12

electrons in the outermost shell

valence electrons

13

nonmetals

gases or brittle solids; usually poor conductors of electricity

14

occur when atoms gain or lose neutrons

isotopes

15

left of the staircase on periodic table

metals

16

elements are listed in order of __

increasing atomic number

17

protons + neutrons

mass

18

1st shell

2 electrons

19

probability of finding electrons in a given area

shell

20

anything that has mass and occupies space

matter

21

release of energy

radiation

22

protons and neutrons do not

have to be equal

23

study if matter and its interactions

chemistry

24

atomic number =

number of protons

25

radioactive decay

allows the isotope to assume a more stable form

26

2nd shell

8 electrons

27

__ elements occur in nature

92

28

elements are defined by

atomic number

29

volume of the atom is

mostly empty space

30

neutrons

no charge larger than protons found in the nucleus