Which of the following elements has the smallest atomic radius?
a) Carbon
b) Nitrogen
c) Oxygen
d) Fluorine
d) Fluorine
Which of the following elements is the most reactive?
a) Chlorine
b) Bromine
c) Fluorine
d) Helium
c) Fluorine
Oxygen is more reactive than nitrogen.
True
False
True
A neutral atom of chlorine (Cl) has an average mass of 35 amu and 17 electrons. How many neutrons does it have?
17
35
18
52
To determine the number of neutrons in an atom, we subtract the number of protons (which is the atomic number) from the atomic mass.
In this case, the atomic mass of chlorine (Cl) is given as 35 amu and the atomic number (which is equal to the number of protons and electrons) is 17.
So, the number of neutrons in chlorine can be calculated as 35 (atomic mass) - 17 (atomic number) = 18.
Therefore, chlorine has 18 neutrons.
The element manganese is represented by the symbol ____. (Capitalization is important.)
Fill in the blank.
The element manganese is represented by the symbol Mn.
Match the element with its description.
Match Term Definition
Sodium A) Highly reactive gas
Silicon B) Nonreactive gas
Bromine C) Has properties of both metals and nonmetals
Argon D) Malleable, soft, and shiny