Select the correct answer. Which of these elements is a noble gas?
Unit 5 Atom and Periodic Table Post Test

Quiz
•
Science
•
9th Grade
•
Hard
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
hydrogen (H)
barium (Ba)
nitrogen (N)
krypton (Kr)
bromine (Br)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which option describes a similarity and a difference between isotopes of an element?
same atomic number; different number of protons
same number of protons; different atomic number
same atomic number; different mass number
same mass number; different atomic number
same number of neutrons; same number of protons
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the correct answer. The image shows a portion of the periodic table. Which two elements have similar characteristics?
neon and fluorine
chlorine and sulfur
fluorine and chlorine
oxygen and chlorine
argon and fluorine
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the correct answer. Identify Bohr's model of the atom. His model describes the reactivity of an element based on its number of valence electrons.
A
B
C
D
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Select the correct answer. The frequency of a given region of the electromagnetic spectrum is more than 3 x 10^19 HZ. Note that the speed of light is 2.998 x 10^8 m/s. Which waves are found in this region?
gamma rays
visible light
microwaves
radio waves
x-rays
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Thallium consists of 29.5% Tl-203 and 70.5% Tl-205. What is the relative atomic mass of thallium?
203 amu
204 amu
203.5 amu
205.3 amu
204.4 amu
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the periodic table of elements, what do all of the elements in group 2 have in common?
An atom of each element can hold up to eight electrons in its outer energy level.
An atom of each element can hold up to six electrons in its outer energy level.
Each element is an alkaline earth metal.
Each element is a halogen.
Each element is dull, brittle, and breaks easily.
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