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Worksheetschemical combinations
Total questions: 20
Worksheet time: 12mins
Atoms of…… ………….tend to lose an electron or more during the chemical reaction and changes into……………..
metals , positive ion
non-metals , positive ions
metals , negative ions
non-metals , negative ions
In the double covalent bond, each atom shares with……….... electrons
1
2
3
4
Covalent bond is formed among two……………elements
metal
non-metals
inert
The types of covalent bonds are………………, ……………. And…………………….
single
double
triple
ionic
In…………..element, the atoms don't lose or gain any electrons.
metal
non-metals
inert
The number of electrons in oxygen ion is……………..electrons
2
6
8
10
The number of electrons in oxygen ion is……………..electrons
2
6
8
10
give reason
The bond in the hydrogen molecule is a single covalent bond
because each atom shares the other atom with one electron.
because each atom shares the other atom with two electrons.
because each atom shares the other atom with three electrons.
All metals are solids except………………which is a liquid.
lead
bromine
mercury
gold
All non -metals are solids except………………which is a liquid.
lead
bromine
mercury
gold
When atom is changed into ion, the - - - - - - - is changed
No. Of electrons
No. Of protons
No. Of neutrons
Mass no.
All of the following are ionic molecules except - - - - - - - -
O2
Nacl
MgO
HCl
---------------- is an atom which gain an electron or more during chemical reactions
Positive ion
Negative ion
Neutral ion
Noble atom
No of electrons in outer level of aluminium
(atomic no. =13)
1
2
3
4
Type of bond between (X and Y) have atomic no. (8 and 12)
Single covalent bond
Double covalent bond
Trible covalent bond
Ionic bond
No. of energy levels in chloride ion= No. of energy level in argon atom
(CL-atomic no. =17)
(Ar-atomic no. =18)
true
false
No of electrons in negative ion - - - - - - - No of protons inside the nucleus
<
>
=
No. Of energy level in negative ion - - - - - - - No. Of energy level in its ion
<
>
=
No. Of energy levels in positive ion-----------No. Of energy level in its atom
<
>
=
All Noble gases contain 8 electrons in outershell except - - - - -
Hellium
Argon
Neon
