WorksheetsThe Periodic Table, Valency and Ions
Total questions: 15
Worksheet time: 8mins
How many electrons are there in the valence shell of the O2– ion?
2
8
10
6
An atom that loses or gains electrons is called a(n)
isotope.
proton.
neutron.
ion.
Which of the following correctly represents the electronic distribution in the Mg atom? .
3, 8, 1
2, 8, 2
1, 8, 3
8, 2, 2
A molecule of a compound is electrically _______________.
positive
negative
either a) or b)
neutral
The electronic configuration of chlorine is
2,7
2,8,8,7
2,8,7
2,7,8
Which of the following is the symbol of the element silver?
Au
Al
Ag
Hg
The correct symbol for copper is ______.
C
Cl
Cr
Cu
To find the number of valence electrons in an atom of a representative element, simply look at its ............... number.
group
period
................................. are diagrams that show valence electrons in the atoms of an element as dots.
Electron dot structures
Proton dot structures:
Neutron dot structures:
Atoms of nonmetals tend to lose their valence electrons.
True
False
An anion is an atom or group of atoms with ................ charge.
a negative
a positive
no
How many valency electrons are in oxygen.
8O
5
6
7
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.
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.
Cations have what type of charge?
Positive
Negative
