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Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 14
1.
Define A group ( in a periodic table ) ? Short..Answer...............................................
Group is a collection of similar chemical elements in a vertical column of periodic table. There are 18 such groups, and elements in the same group have ------- properties
a) similar
b) different
2.
Group number of an element indicates?
a) Number of valence electrons in outermost shell
b) Number of protons in nucleus
c) Number of vacant spaces in outer most shell
d) Total number of electrons in last two shells
3.
Sulphur belongs to group VI (6) because it has ________ electrons in its outermost shell.
a) Seven
b) Eight
c) Give
d) Six
4.
Define valency or valence? Short..Answer………………………………… The chemical combining power of atoms or groups measured by the number of electrons the atom or group will receive, give up, or share in forming a ---------.
a) mixture
b) compound
5.
First period of modern periodic table contain ______ elements.
a) 24
b) 8
c) 18
d) 2
6.
In periods the atomic radius increases from?
a) Bottom to top
b) Top to bottom
c) Right to left
d) Left to right
7.
What are actinides? Short..Answer............................................... Chemical element in the series of radioactive elements beginning with that range from actinium at atomic number 89 and ending with lawrencium at atomic number -------.
a) 103
b) 105
8.
What are lanthanides? Short..Answer............................................... A group of the rare earths that range from lanthanum at atomic number 57 to lutetium at atomic number 71. It contains 15 elements that share closely related ------- properties.
a) chemical
b) physical
9.
What do you understand by halogens? Short..Answer...............................................
Halogens are electronegative chemical element or any of the five ----------- elements, fluorine, chlorine, iodine, bromine, or astatine.
a) electronegative
b) electrostative
10.
6A group elements can have valency _____ or ________.
a) 2 or 6
b) 3 or 6
c) 2 or 7
d) 2 or 5
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