4.2 The Atom Flashcards Preview

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Flashcards in 4.2 The Atom Deck (11):
1

proton

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

2

atomic mass unit

a unit of mass used to express atomic and molecular weights

3

neutron

a subatomic particle of about the same mass as a proton but without an electric charge

4

atomic number

the number of protons in a nucleus

5

isotope

an atom that has the same number of protons

6

mass number

the sums of the numbers of protons and neotrons

7

atomic mass

the mass of an atom expressed in atomic mass units

8

gravitational force

is the force that attracts any object with mass.

9

electromagnetic force

when opposite attract each other

10

strong force

when protons push away from each other.

11

weak force

in certain unstable atoms, a neutron can be planned out.