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QuickCheck Review- Unit 1
Test Description: Atoms and Periodic Table
Instructions: Answer all questions to get your test result.
1) Atoms of which of the following elements are MOST similar in atomic mass to copper (Cu) atoms?
A
zinc (Zn)
B
gold (Au)
C
mercury (Hg)
D
silver (Au)
2) 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 particles in the nucleus of the unknown element
B
The total number of neutrons in 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
3) An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
A
-30
B
+25
C
+30
D
-25
4) How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
A
106 protons, 72 neutrons, 106 electrons
B
72 protons, 106 neutrons, 72 electrons
C
178 protons, 250 neutrons, 72 electrons
D
72 protons, 178 neutrons, 106 electrons
5) 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 valence electrons
B
The number of neutrons
C
The location of valence electrons
D
The number of protons
6) Which of the following list the elements in order, from those having the fewest protons to those having the greatest number of protons?
A
Ar, I, Br, Cl, F
B
Cs, Rb, Po, At, Rn
C
Li, Be, He, C, N
D
N, P, As, Sb, Bi
7) Which of the following lists contains atoms with the highest reactivity?
A
F, Cl, Br
B
C, Si, B
C
Zn, Cd, Hg
D
He, Ne, Ar
8) What best explains why sodium is more likely to react with another element than an element such as neon?
A
Sodium has one more electron than neon.
B
Sodium has one fewer proton than neon.
C
Sodium has one fewer electron than neon.
D
Sodium has one more neutron than neon.
9) Which following statements is true?
A
Proton location determines properties such as luster.
B
Electrons contribute most of the mass of an atom
C
Electron placement determines an atom’s reactivity.
D
Neutrons determine whether an atom is liquid at room temperature.
10) Elements in a periodic table are arranged from left to right and top to bottom in order of —
A
sum of the number of protons and electrons
B
decreasing atomic mass
C
increasing specific heat
D
increasing atomic number
*select an answer for all questions
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