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19 Cards in this Set

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  • Back

Which subatomic particle(s) are found in the nucleus of an atom?

Protons and Neutrons

Experimental evidence indicates that the nucleus of an atom

contains most of the mass of an atom

What is the charge and mass of a proton?

charge of +1 and mass of 1 amu

Which statement best describes electrons?

They are negative subatomic particles and found surrounding the nucleus.

How many electrons does O-2 have?

10

The atomic number is equal to

the number of protons in the atom.

An atom of 52 24Cr has a nucleus that contains a total of

24 neutrons

The atoms in a sample of an element must contain nucleus with the same number of

Nuetrons

What is the total number of electrons in an atom of an element with an atomic number of 20 and a mass number of 40?

20

What is the mass number of an atom that contains 11 protons, 11 electrons, and 12 neutrons?

23

What is the mass number of 3 1H?

1

What is the total number of protons and neutrons in an atom of 91 40 Zr?

40

Isotopes are atoms that have the same number of protons but a different

number of neutrons.

What is a symbol for an atom containing 36 protons and 48 neutrons?

Kr

What is average atomic mass of Lithium if 7.42% exists as 6Li and 92.58% exists as 7Li?

6.93 amu

An element occurs as a mixture of isotopes. The atomic mass of the element is based upon

both the masses and the relative abundances of the individual isotopes.

Which energy level or shell can hold a maximum of 18 electrons?

3

For an aluminum atom, which energy level contains the most electrons?

2

How many electrons are in the outermost principle energy level (shell) of an atom of sodium?

1