WorksheetsPeriodic Classification of elements-DT
Total questions: 10
Worksheet time: 12mins
The three elements having chemical symbols of Si, B and Ge are-
All metals
All non metals
All metalloids
Si is metalloid
B is metal
Ge is non metal
Which is the best description of an element?
A substance that cannot be broken down into simpler substances
A collection of atoms that have different abilities when joined together
A man-made mineral
A mixture of substances
In an element box, the number at top is the
atomic number
atomic name
atomic mass
atomic symbol
The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds
alkali metals (group 1)
Halogens (Group 17)
atomic number
valence electrons
The valency of noble gases, in general is ______.
0
1
2
8
To complete the octate, outer most shell of Magnesium ______.
looses two electrons
gains three electrons
looses three electrons
shares four electrons
The number of neutrons in an atom can be found by
adding the number of neutrons and protons together.
adding the atomic mass and the atomic number.
subtratcting the atomic number from the atomic mass.
subtracting the atomic mass from the atomic number.
The smallest particle of an element that has the same chemical properties of the element is
a molecule of that element.
an atom of that element.
a proton of that element.
the nucleus of the element.
The Periodic Table of elements is arranged according to an element's
color
state of matter
place in the alphabet
properties
