QuickCheck Review- Unit 1 Question Preview (ID: 43572)


Atoms And Periodic Table.[print questions]

What best explains why sodium is more likely to react with another element than an element such as neon?
a) Sodium has one fewer proton than neon.
b) Sodium has one more neutron than neon.
c) Sodium has one fewer electron than neon.
d) Sodium has one more electron than neon.

Which following statements is true?
a) Electrons contribute most of the mass of an atom
b) Electron placement determines an atom’s reactivity.
c) Proton location determines properties such as luster.
d) Neutrons determine whether an atom is liquid at room temperature.

Which of the following list the elements in order, from those having the fewest protons to those having the greatest number of protons?
a) N, P, As, Sb, Bi
b) Li, Be, He, C, N
c) Cs, Rb, Po, At, Rn
d) Ar, I, Br, Cl, F

Which of the following lists contains atoms with the highest reactivity?
a) He, Ne, Ar
b) F, Cl, Br
c) Zn, Cd, Hg
d) C, Si, B

A chemist is identifying the elements present in a sample of seawater. What characteristic of an element’s atoms always determines the element’s identity?
a) The number of protons
b) The number of neutrons
c) The location of valence electrons
d) The number of valence electrons

How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
a) 72 protons, 178 neutrons, 106 electrons
b) 72 protons, 106 neutrons, 72 electrons
c) 178 protons, 250 neutrons, 72 electrons
d) 106 protons, 72 neutrons, 106 electrons

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
a) +25
b) +30
c) -25
d) -30

Atoms of which of the following elements are MOST similar in atomic mass to copper (Cu) atoms?
a) gold (Au)
b) mercury (Hg)
c) silver (Au)
d) zinc (Zn)

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
a) The total number of neutrons in the unknown element
b) The total number of particles in the nucleus of the unknown element
c) The number of protons in the nucleus of the unknown element
d) The number of valence electrons in the unknown element

Elements in a periodic table are arranged from left to right and top to bottom in order of —
a) increasing specific heat
b) increasing atomic number
c) decreasing atomic mass
d) sum of the number of protons and electrons

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