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Science: Middle School: Grades 6, 7 and 8 Quiz - Atoms and Elements 4 (Questions)

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A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. In Science, the periodic table contains about 118 elements so far, but this may very well increase if we discover more elements.

A pure substance in which all of the atoms are identical is a description of .......

[ ]	a compound
[ ]	a mixture
[ ]	an alloy
[ ]	an element

In the periodic table, the elements are arranged in order of increasing .......

[ ]	alphabetical symbol
[ ]	electron number
[ ]	mass number
[ ]	proton number

The elements in group 7 of the periodic table are .......

[ ]	conductors
[ ]	gases
[ ]	metals
[ ]	non-metals

The name of the element with the symbol Na is .......

[ ]	napthalene
[ ]	neon
[ ]	nickel
[ ]	sodium

The name of a gas used in weather balloons is .......

[ ]	chlorine
[ ]	hydrogen
[ ]	neon
[ ]	nitrogen

Which of the following is a halogen?

[ ]	Argon
[ ]	Fluorine
[ ]	Helium
[ ]	Neon

Lithium floats on water as it .......

[ ]	is a non-metallic element
[ ]	is a solid
[ ]	is less dense than water
[ ]	is more dense than water

Li, Na, K and Cs are group 1 elements. The most reactive is .......

[ ]	Cs
[ ]	K
[ ]	Li
[ ]	Na

The following elements are named after countries except .......

[ ]	Fr
[ ]	Ge
[ ]	I
[ ]	Po

10.

The following elements are named after famous scientists except .......

[ ]	curium
[ ]	einsteinium
[ ]	nobelium
[ ]	uranium

Science: Middle School: Grades 6, 7 and 8 Quiz - Atoms and Elements 4 (Answers)

A pure substance in which all of the atoms are identical is a description of .......

[ ]	a compound
[ ]	a mixture
[ ]	an alloy
[x]	an element

In the periodic table, the elements are arranged in order of increasing .......

[ ]	alphabetical symbol
[ ]	electron number
[ ]	mass number
[x]	proton number

The elements in group 7 of the periodic table are .......

[ ]	conductors
[ ]	gases
[ ]	metals
[x]	non-metals

Group 7 is called the halogens

The name of the element with the symbol Na is .......

[ ]	napthalene
[ ]	neon
[ ]	nickel
[x]	sodium

The name of a gas used in weather balloons is .......

[ ]	chlorine
[x]	hydrogen
[ ]	neon
[ ]	nitrogen

Both hydrogen and helium are less dense than air. Helium is used in airships as it is unreactive and so safer than hydrogen (check out the Hindenburg disaster). Hydrogen, however, is still used in weather balloons as it is cheaper than helium.

Which of the following is a halogen?

[ ]	Argon
[x]	Fluorine
[ ]	Helium
[ ]	Neon

The halogens are in group 7

Lithium floats on water as it .......

[ ]	is a non-metallic element
[ ]	is a solid
[x]	is less dense than water
[ ]	is more dense than water

Lithium is a metal in group 1

Li, Na, K and Cs are group 1 elements. The most reactive is .......

[x]	Cs
[ ]	K
[ ]	Li
[ ]	Na

The elements in group 1 increase in reactivity as you go down the group

The following elements are named after countries except .......

[ ]	Fr
[ ]	Ge
[x]	I
[ ]	Po

Fr Francium - France, Po Polonium - Poland, Ge Germanium - Germany. There are several more!!

10.

The following elements are named after famous scientists except .......

[ ]	curium
[ ]	einsteinium
[ ]	nobelium
[x]	uranium

Uranium was named after the planet Uranus