Science Flashcards

Front 1

In his gold foil experiement, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because

Back 1

-most of the particles passed straight through the foil
-some particles were slightly deflected
-a few particles bounced back

Front 2

True of False?
The ATOMIC NUMBER of an element is the number of protons and neutrons in the nucleus.

Back 2

False

Mass Number

Front 3

True of False

All atoms of the same element contain the same number of NEUTRONS

Back 3

False

Protons

Front 4

True of False
The MASS NUMBER is an average of the masses of all naturally occurring isotopes of an element

Back 4

False

Atomic Mass

Front 5

True of False?

PROTONS have no electrial charge

Back 5

False

Neutrons

Front 6

protons

Back 6

the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number, which determines the identy of an element.

Front 7

The discovery of which particle proved that the atom is not indivisble?

Back 7

Electon

Front 8

how many protons does an atom with an atomoic number of 23 and a mass number of 51 have?

Back 8

23

Front 9

True of False
The MASS NUMBER is an average of the masses of all naturally occurring isotopes of an element

Back 9

False

Atomic Mass

Front 10

An atom has no overall charge if it contains equal number of

Back 10

electons and protons

Front 11

True of False
Protons are part of the nucleus of an atom

Back 11

TRUE

Front 12

True of False

Neutorns have a mass of 1 amu

Back 12

True

Front 13

What determines the idently of an element?
atomic number
mass number
atomic mass
overall charge

Back 13

atomic number

Front 14

nucleus

Back 14

the particles of the nucleus that have no charge

Front 15

model

Back 15

a representaion of an object of system

Front 16

Atom

Back 16

the smallest particle into which an element can be divided and stll retain all of the properites of that elelment.

Front 17

electrons

Back 17

the negatievely charged particles found in all atom; electrons are involved in the formation of chemical bonds

Front 18

theory

Back 18

a unifying explanation for a broad range of hypotheses and observiations that have been suported by testing.

Front 19

electron clouds

Back 19

the regions inside an atom where electrons are likely to be found

Front 20

neutrons

Back 20

the particles of the nucleus that have no charge

Front 21

atomic mass unit (amu)

Back 21

the SI unit usedto express the masses of particles in atoms

Front 22

isotopes

Back 22

atoms that have the same number of protons but have different number of neutrons

Front 23

atomic number

Back 23

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element

Front 24

True of False?

Electons are found in the NUCLEUS of an atom

Back 24

False

Electon Cloud

Front 25

mass number

Back 25

the sum of the protons and neutrons in an atom

Front 26

atomic mass

Back 26

the weighted average of the masses of all the naturally occurring isotopes of an element