The Atom
Name _______________________________________________
Date ________________________________
Period _______
1) All matter is made of tiny little pieces called __________________.
2) Complete the following table about the structure of the atom.
Subatomic Particle
Does it have mass? (yes
or no)
location
Charge
3) List the following terms in order of INCREASING size: atom, proton, electron, cell, element
Neutrality
1) What does it mean for an atom to be neutral?
2) A Neutral atom must have an equal number which two subatomic particles?
3) Which of the following atoms is neutral?
a. Atom #1: 18 protons, 20 neutrons, 17 electrons
b. Atom #2: 13 electrons, 16 protons, 16 neutrons
c. Atom #3: 27 neutrons, 31 protons, 31 electrons
4) How many electrons does a neutral atom of Potassium (K) have?
5) Is an atom of Potassium with 19 protons and 18 electrons neutral? What is the overall charge of this atom of
Potassium? How many electrons does Potassium need in order to become neutral?
6) How many electrons does a neutral atom of Uranium (U) have?
7) Is an atom of Uranium with 92 protons and 94 electrons neutral? What is the overall charge of this atom of
Uranium? How many electrons does Uranium need to lose in order to become neutral
Atomic & Mass Numbers
1) The number of protons an atom has is also called the ______________ number.
2) The number of protons plus the number of neutrons is called the ____________ number.
3) Give the number of protons for each of the following elements.
a. Helium _____
b. Nitrogen _____
c. Radon _____
d. Sulfur _____
4) Give the mass number of the following elements.
a. Titanium (Ti) _____
b. Tin (Sn) _____
c. Oxygen (O) _____
d. Hydrogen (H) _____
5) If a Lithium atom has 3 protons, 3 electrons, and 5 neutrons, what is its (a) atomic # and (b) mass #?
6) Given the atomic and mass numbers of an atom, how do you determine how many neutrons that atom has?
7) If I have an atom of Aluminum (Al) a mass number of 27, how many protons must it have?
8) Calculate the number of protons, neutrons, and electrons in Carbon. Show your work!
9) Calculate the number of protons, neutrons, and electrons in Chlorine. Show your work!
10) Complete the following table:
Substance
Bromine
Symbol
Atomic
Number
Mass
Number
Al
13
27
Br
Number of
Protons
80
I
Platinum
Pt
Number of
Electrons
35
30
Iodine
Number of
Neutrons
35
74
78
53
117
Groups & Periods
1) Shade in both a period and a group on the periodic table below.
2) Number the periodic table above with the correct group and period numbers.
3) Which group are the following elements in?
a. Chromium (Cr) _____
b. Antimony (Sb) _____
c. Iodine (I) _____
4) Which period are the following elements in?
a. Molybdenum (Mo) _____
b. Calcium (Ca) _____
c. Manganese (Mn) _____
5) Give an example of an element from the 5th group of the periodic table. _____________________
6) Given an example of an element in the 4th period of the periodic table. _____________________