WorksheetsAtomic Structure
Total questions: 31
Worksheet time: 25mins
Atoms of elements in the same group of the periodic table share the same ___
number of energy levels
number of valence electrons
atomic numbers
atomic masses
What is an atom’s nucleus made of?
protons and electrons
protons only
protons and neutrons
neutrons only
How many electrons will a neutral atom of carbon have if its nucleus has 6 protons and 8 neutrons?
2
6
8
14
The one- or two-letter abbreviation of an element on the periodic table is called its ___
short form
symbol
letters
contraction
An element with 5 protons, 6 neutrons, and 5 electrons has an atomic number of __
5
6
10
11
An element with 5 protons, 6 neutrons, and 5 electrons has a mass number of ___
5
6
10
11
The farther an electron is from the nucleus, the more ______ it has.
charge
energy
mass
size
Atoms of the same element that have different numbers of neutrons are called ___
molecules
compounds
protons
isotopes
For what reason is atomic mass in a decimal form on the periodic table?
it is the relative atomic mass of all isotopes of the element
there are parts of protons and neutrons that do not add up to a whole number
the total mass of all of an atom's subatomic particles is very specific
Chemists these days have very precise instruments to measure the atomic mass
The total number of electrons in the outer shell of a sodium (Na) atom is ___
1
2
8
18
Which particle(s) determine(s) the atomic number of an element?
protons only
neutrons and protons
neutrons only
What are the first two elements in period 4?
Be & Mg
K & Ca
C & Si
Ti & Zr
The total number of neutrons in the nucleus of any atom is equal to the ___
mass number of the atom
atomic number of the atom
atomic number minus the mass number
mass number minus the atomic number
Two different isotopes of an element have different ___
numbers of protons
numbers of neutrons
atomic numbers
nothing is different about them
Two different isotopes of an element have the same ___
number of protons
number of neutrons
mass numbers
nothing is the same about them
The maximum number of electrons that can occupy the 2nd shell of an atom is ___
1
2
8
18
The mass of the most common isotope of an element is known based on an element's ___
mass number
average atomic mass
atomic number
number of electrons
Which element does this diagram represent?
calcium Ca
sodium Na
carbon C
Magnesium Mg
An atom is neutral because ___
neutrons balance the protons and electrons
nuclear forces stabilize the charges
the numbers of protons and electrons are equal
the numbers of protons an neutrons are equal
Which part of the periodic table indicates the number of energy levels in the electron cloud?
group
family
valence electrons
period
What is the correct nuclear notation for an isotope of carbon with 6 protons and 6 neutrons?
12C
12C
6C
6C6
Name the element with 1 valence electron, in period 2.
hydrogen H
beryllium Be
lithium Li
helium He
A subatomic particle with a positive charge.
proton
neutron
electron
quark
The positively charged center of the atom where most of the mass of the atom is located.
proton
electron cloud
nucleus
none of these
A subatomic particle with a negative charge.
proton
neutron
electron
quark
The negatively charged area around the nucleus where the volume of the atom is located.
nucleus
electron cloud
valence electron
quarks
The subatomic particle with no charge (therefore electrically neutral).
proton
neutron
electron
quark
The smallest known particles that make up protons and neutrons.
electrons
electron cloud
quarks
nucleus
This element is in the same family as Br, but has fewer protons than Mg. It must be ___
F
Cl
I
Na
This element has 6 energy levels and 8 valence electrons. It must be ____
O
Rn
Os
C
This metal in in alkaline earth metals group and has 3 energy levels. It must be ___
Na
Mg
Al
P
