Chemistry Final 1 Of 3 Question Preview (ID: 34377)
Chem Final.
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Atoms have no electric charge because they
a) have an equal number of charged and non-charged particles
b) Have neutrons in their nuclei
c) Have an equal number of electrons and protons
d) Have an equal number of neutrons and protons
A subatomic particle that has a negative charged is called
a) Molecule
b) electron
c) Element
d) Compound
Which of the following statements is not true?
a) Protons have a positive charge
b) A nucleus has a positive charge
c) Neutros have no charge
d) Neutrons have a negative charge
What is an atom's nucleus made of?
a) Protons and neutrons
b) only protons
c) only neutrons
d) anodes
The charge of an atom is
a) neutral
b) positive
c) negative
d) unbalanced
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?
a) 30
b) 56
c) 26
d) 82
An element's atomic number is equal to its number of
a) protons
b) neutrons
c) valence electrons
d) protons and neutrons
Two different isotopes of an element have different
a) numbers of neutrons
b) numbers of protons
c) atomic numbers
d) numbers of electrons
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?
a) 19
b) 20
c) 39
d) 58
Oxygen's atomic number is 8. This means that an oxygen atom has
a) eight neutrons in its nucleus
b) a total of eight protons and neutrons
c) eight protons in its nucleus
d) a total of eight neutrons and electrons
Which statement about an element's average atomic mass is correct?
a) It is determined by counting the number of isotopes in a sample of the element
b) it is equal to one-twelfth the mass of the most common isotope
c) it is a weighted average, so common isotopes have a greater effect than uncommon ones
d) it is based on an isotope's charge, so negatively charged isotopes have a greater effect than positive ones
An atom's mass number equals the number of
a) protons plus the number of electrons
b) protons plus the number of neutrons
c) protons
d) neutrons
The nucleus of an atom consists of 8 protons and 6 neutrons. The total number of electrons present in a neutral atom of this element is
a) 6
b) 8
c) 2
d) 14
Which of the following particles has the least mass?
a) neutron
b) electron
c) proton
d) hydrogen nucleus
The cathode ray tube was instrumental in the discovery of
a) the electron
b) the proton
c) the neutron
d) the atom
The gold foil experiment contributed to the discovery that:
a) atoms contain electrons
b) atoms are mostly empty space
c) atoms contain a nucleus
d) both that atoms are mostly empty space and that atoms contain a nucleus
A sample of element X contains 90% X-35 atoms, 8.0% X-37 atoms, and 2% X-38 atoms. The average atomic mass will be closest to which value?
a) 35
b) 36
c) 37
d) 38
The atomic mass of an element is defined as the weighted average mass of that element's
a) naturally occurring isotopes
b) least abundant isotopes
c) radioactive isotopes
d) most abundant isotope
Compared to the entire atom, the nucleus of the atom is
a) smaller and contains most of the atom's mass
b) small and contains little of the atom's mass
c) larger and contains most of the atom's mass
d) larger and contains little of the atom's mass
Which symbols represent atoms that are isotopes?
a) C-14 and N-14
b) I-131 and I-131
c) O-16 and O-18
d) Rn-222 and Ra-222
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