Chemistry Test Practice
According to Bohr's model of the atom, electrons behave like a. planets orbiting the sun. b. waves on a vibrating string. c. light energy in a vacuum. d. planets rotating on their axe
a
Columns on the periodic table are known as __________. a. groups b. nonmetals c. metalloids d. periods
a
How many electrons can an orbital contain? a. 2 b. 4 c. 3 d. 1
a
How many valence electrons does a group 1A metal atom have? a. 1 b. 2 c. 3 d. 4
a
The principle that states each electron occupies the lowest energy orbital available is the ______________. a. aufbau principle b. uncertainty principle c. exclusion principle d. photoelectric principle
a
What is an electron dot structure? a. An element symbol surrounded by dots representing its valence electrons. b. An element symbol surrounded by its innermost electrons. c. An element symbol with a positive charge. d. A filled noble gas in brackets plus the remaining electron configuration expressed by filled orbitals.
a
Which atom or ion has 16 protons and 18 electrons? a. S2- b. Ne2+ c. F- d. N+
a
Each family, or group of elements in a vertical column of the periodic table has elements with chemical characteristics that are (A). exactly the same. (B). similar. (C). different. (D). exactly opposite.
b
How many protons are present in Ba2+? a. 54 b. 56 c. 58 d. 0
b
The masses of all isotopes are based on a comparison to the mass a particular isotope of (A). hydrogen. (B). carbon. (C). oxygen. (D). uranium.
b
Valence electrons determine an atom's a. mass. b. chemical properties c. atomic number. d. period.
b
According to Bohr's theory, an electron's path around the nucleus defines its a. electric charge b. atomic mass c. energy level. d. speed
c
An atom of an element belonging to the halogen family has (A). one outer shell electron. (B). two outer shell electrons. (C). all outer shell electrons but one. (D). all outer shell electrons.
c
An element whose atoms have four valence electrons is _______. a. Nb b. Cr c. Sn d. Ti
c
Atoms of elements that are in the same group have the same number of a. protons. b. neutrons c. valence electrons. d. protons and neutrons.
c
Atoms that lose electrons to form positive ions are __________. a. metalloids b. noble gases c. metals d. nonmetals
c
The concept that all moving particles have wave characteristics is attributed to ___________. a. Heisenberg b. Bohr c. de Broglie d. Thomson
c
What is an electron dot structure? a. A filled noble gas in brackets plus the remaining electron configuration expressed by filled orbitals. b. An element symbol with a positive charge. c. An element symbol surrounded by dots representing its valence electrons. d. An element symbol surrounded by its innermost electrons.
c
What is the lowest energy state of an atom called? a. the excited state b. the solid state c. the ground state d. the chaotic state
c
When an atom loses energy by electron transition, a(n) _____________ is produced. a. absorption b. ion c. emission d. adsorption
c
Which of the following belongs to the halogen family of elements? (A). sodium (B). calcium (C). chlorine (D). neon
c
Which of the following elements is a metalloid? a. W b. Na c. As d. F
c
Which of the following is an ion? a. C b. HCl c. O2- d. lithium-3
c
Which of these is not an orbital? a. s b. p c. x d. f
c
An atom of an element belonging to the noble gas family has (A). one outer shell electron. (B). two outer shell electrons. (C). all outer shell electrons but one. (D). all outer shell electrons.
d
Elements in the d block are also known as _______________. a. alkali metals b. alkaline earth metals c.lanthanide metals d. transition metals
d
The sum of the number of protons and neutrons in the nucleus of an atom is called the (A). atomic number. (B). atomic mass. (C). atomic weight. (D). mass number.
d
The valence orbitals in an atom are the ___________. a. innermost orbitals b. second energy level c. d orbitals d. outermost orbitals
d
Which of the following elements is an alkali metal? a. calcium b. magnesium c. mercury d. sodium
d
As the number of valence electrons in non-metals increases across a period on the periodic table, the atomic radii a. increases b. remain constant c. decrease d. vary considerably
?
How many valence electrons are there in an atom of tellurium (Te)? A. 0 B. 2 C. 4 D. 6
?
How many valence electrons are there in the electron configura on for F‐1? A. 1 B. 6 C. 7 D. 8
?
Which of the following describes what takes place when iron (Fe) is ionized to Fe2+? A. a gain of two electrons B. a loss of two electrons C. a gain of two protons D. a loss of two protons
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