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WorksheetsAtoms and Molecules
Total questions: 60
Worksheet time: 3hrs 0mins
All matter is made of what
energy
atoms
electrons
compounds
The central region of an atom where its neutrons and protons are is called it's __________ .
nucleus
electron cloud
core
center
How would O2 be qualified. Check all answers that apply.
Atom
Molecule
Compound
What are atoms composed of?
Protons and electrons.
Protons, neutrons, and electrons.
Neutrons and electrons.
Ions, elements, and compounds.
Atomicity is ......
the number of atoms present in an element.
the number of atoms present in a molecule.
atomic mass
none of the above
The bonding capacity of an element is called......
Atomic number
Atomic Mass Unit
Molecular mass
Valency
'S' is the symbol of ....
Silicon
Sulfur
Sodium
Above all
The symbol of Gold is......
G
Ag
Au
Go
Valency of inert gas elements.
0
2
1
3
Valency of Hydrogen is......
1
2
3
4
The chemical symbol for sodium is
so
SO
Na
NA
Atomic number of oxygen is
4
6
8
12
valency of helium is
0
3
2
1
which of the following is a noble gas
helium
oxygen
aluminium
hydrogen
Which term defines a substance that is formed by the combination of elements using fixed amounts?
atom
compund
element
molecule
Which term defines any substance that cannot be broken down into a simpler substance?
atom
molecule
element
compound
Where are electrons found?
the nucleus
next to the neutrons
the proton
orbiting the nucleus
What is an ion?
a charged atom
an atom with different neutrons
atoms with no protons
atoms with no electrons
An element has 5 valence electron , what is its valency?
4
3
2
1
An atom has four shells and 19 protons in its atom , what is its valency?
1
2
3
4
what is valency of the given element?
1
2
3
4
A valence electron is what?
The electron in the outer shell of an atom.
The electron in the inner shell of an atom.
The last electron.
The first electron.
The valence electron can
Cannot interact in a chemical reaction.
Can interact in a chemical reaction.
Atoms are electrically neutral when
They have a minimal charge.
They have a balanced number of protons and neutrons.
They have a balanced number of protons and electrons.
They have no valance electrons.
If an electron is removed, an ion becomes
An atom
Positive
Negative
Neutral
If an ion gains an electron, it becomes
Positive
Stable
Atomic
Negative
Anions have which type of charge?
Positive
Negative
ALL anions are
Metal
Transitional Metals
Nobel Gases
Non-Metal
Cations have what type of charge?
Positive
Negative
The electronic configuration of Neon is
2,8
2,7
2,8,8
2,6
What's the chemical name of Natrium?
Silicon
Sodium
Potassium
Magnesium
The electronic configuration of Potassium is
2,8,8,1
2,8,7
2,8,8
2,8,1
Which of the following does not have 8 valence electrons?
Ar
Ne
Xe
He
An element has 3 electrons in the valence M shell. The symbol of the element is ___.
B
Al
Mg
Ca
The capacity of the M shell is __________, but in Potassium, the M shell holds _________ electrons.
2 electrons, 8
18 electrons, 8
8 electrons, 18
32 electrons, 18
The charge on any ion would depend on loss or gain of ____.
electrons
protons
neutrons
positrons
Valency of Chlorine
0
1
2
If an atom has 8 valence electrons, it is said to be
Not reactive, not stable
Reactive, Not stable
Not reactive, Stable
Valency of Boron is
1
3
2
How many valence electrons are there in Nitrogen?
7
5
6
True or False: Atoms that have a valence electrons of less than eight are not stable.
true
false
