Concept: Atoms


Concept: Isotopes


Concept: Electrons


Problem: Oxygen

8 Protons             Atomic number: 

8 Neutrons          Mass number: 

8 Electrons          Atomic mass:


Problem: If oxygen has 9 electrons it will be a __________________________


Related Topics

Atoms Additional Practice Problems

Ionizing radiation does NOT include:

A. gamma rays

B. UV rays

C. X-rays

D. cosmic rays

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The smallest chemical unit of an element is a molecule.

a. True

b. False

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If a fluorine atom has an atomic weight of 16 and another has an atomic weight of 18 then these atoms are:

a. enantiomers

b. isotopes

c. isomers

d. radioactive

e. unstable

f. ions

g. more than one of the above is correct

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The area around a nucleus where an electron is most likely to be found is called

a. electrical space

b. an organelle

c. polar space

d. radioactive field

e. an orbital

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Atoms in which the number of electrons does not equal the number of protons are known as

a. valences

b. ions

c. isotopes

d. molecules

e. orbitals

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Which of the following elements’ isotopic ratios are used to make absolute determinations of the time of formation of materials?

a. oxygen

b. hydrogen

c. carbon

d. nitrogen

e. radon

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Oxygen ordinarily has 8 protons and 8 neutrons. Another rare form has two extra neutrons. These two forms are

a. oxygen ions

b. oxygen isotopes

c. oxygen compounds

d. oxygen shells

e. oxygen orbitals

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Ordinary oxygen has an atomic mass number of 16 and an atomic number of 8. This means that the number of neutrons in this type of oxygen is

a. 24

b. 8

c. 16

d. not stable

e. none

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The atomic number of an element is equal to the number of

a. protons only

b. neutrons only

c. protons plus electrons

d. protons plus neutrons

e. neutrons plus electrons

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An electron

a. has one negative charge

b. has 1/1840 Dalton of mass

c. is found in an area around the nucleus, called the orbital

d. only a and b are true

e. a, b, and c are true

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A proton

a. has one positive charge

b. has one Dalton of mass

c. is found in the nucleus of the atom

d. only a and b are true

e. a, b, and c are true

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When atoms gain or lose electrons, they become negatively or positively charged. They are known as

a. molecules

b. isotopes

c. ions

d. radioactive

e. unstable atoms

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Negatively charged particles of atoms with almost no mass are called

a. electrons

b. protons

c. neutrons

d. ions

e. polymers

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Organisms are composed of molecules, which are collections of smaller units, called

a. molecules

b. atoms

c. electrons

d. polymers

e. ions

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