WorksheetsAtomic Theory and Periodic Table
Total questions: 20
Worksheet time: 20mins
An element's periodic table identity is defined by its number of
protons
neutrons
isotopes
electrons.
Which number is used to identify an atom?
Y is used because it represents the number of electrons in an atom.
X is used because it represents the number of neutrons in an atom.
Y is used because it does not vary in atoms of the same element
X is used because it does not vary in atoms of the same element.
The nucleus of an atom is surrounded by
a neutron cloud
an electron cloud
rings of orbiting protons
rings of orbiting neutrons
The nucleus of an atom contains which subatomic particles?
neutrons only
protons and neutrons
neutrons and electrons
protons and electrons
Identify the subatomic particle that is NOT contained in the nucleus.
electron
neutron
nucleus
proton
Which part of the diagram represents the nucleus?
A
B
C
D
How many neutrons does a Boron atom have?
3
5
6
8
Which statement is the BEST definition of an atom?
Anything that has mass and occupies space.
The smallest particle that has the properties of an element.
A substance that cannot be broken down chemically into simpler substances
The smallest unit of a substance that exhibits all of the properties characteristic of that substance
Which statement is the BEST definition of an element?
Anything that has mass and occupies space.
The smallest particle that has the properties of an element.
A substance that cannot be broken down chemically into simpler substances
The smallest unit of a substance that exhibits all of the properties characteristic of that substance
Chlorine is the atomic number 17 in the periodic table of elements. What information does the atomic number give you about the element chlorine?
An atom of chlorine has 17 protons+ and neutrons- combined.
An atom of chlorine has 17 protons+
and 17 electrons
An atom of chlorine has 17 protons+ and 17 neutrons+.
Chlorine atoms have 17 of each of the three subatomic particles, protons, neutrons, and electrons.
Consider the information you know about the element Aluminum . Based on that knowledge, which of these statements is NOT true concerning the atomic structure of aluminum?
Aluminum has 13 neutrons.
Aluminum has an atomic number of 13
Aluminum has 13 protons+ in the nucleus.
The number of protons equals the number of electrons.
Mg represents the element
mercury.
manganese.
magnesium
molybdenum.
Consider the element sodium. It's atomic number is __________ and equals ___________.
11: the number of protons
12; the number of neutrons
23; the sum of protons and neutrons
23; the number of electrons
The atom mass represent what two sub-atomic particles.
the sum of number electrons & neutrons
the sum of number protons & electrons
the sum of number electrons & neutrons
the sum of number protons & neutrons
Which describes an atom gold?
31 proton, 31 electron, 39 neutrons
47 protons, 47 electrons, 61 neutrons
64 protons, 64 electrons, 93 neutrons
79 protons, 79 electrons, 118 neutrons
What is the chemical bond that is formed when two atoms share one or more pairs of electrons?
ionic bond
orbital bond
polar bond
covalent bond
Which elements’ atoms will transfer electrons when forming a chemical bond with each other?
Cs and I
P and Cl
Xe and F
N and Br
In the formation of the compound magnesium oxide (MgO),
a magnesium atom donates two electrons to an oxygen atom.
an oxygen atom shares one electron with a magnesium atom.
a magnesium atom shares two electrons with an oxygen atom.
an oxygen atom donates one electrons to a magnesium atom.
What do magnesium and chlorine react to form?
MgCl2
Mg2Cl
MgCl
Mg2Cl2
The chemical formula for calcium fluoride is _____.
CaF
Ca2F
CaF2
Ca7F2
