When nitrogen changes to ion it becomes…………..(7N)
N-2
N+2
N+3
N-3
………………. Oxygen is from
Non-metals
Nobel gases
Metals
All previous answers
……… All the following are correct about metals except
All are malleable and ductile
All are good conductors of electricity
Have 1,2 or 3 electrons in outermost shell
Bad conductor of heat
The number of…………..in the outermost level determines the type of element.
mass
electrons
protons
neutrons
Which of the following is correct about the bond between hydrogen molecule.
Ionic bond
Single covalent bond
Triple covalent bond
Double covalent bond
…………. All the following have covalent bond except
HCl
O2
H2O
MgO
………………. The odd symbol is
2He
18Ar
10Ne
20Ca
…………. There is double covalent bond in molecule of
Hydrogen
Nitrogen
Oxygen
Chlorine
……………… Number on known elements until now is
118
211
121
92
When an atom is changed into ion, the number of ……………is changed.
…………… During formation of magnesium oxide, Magnesium atom
Gains 2 electrons from oxygen atom
Gives 2 electrons to oxygen atom
Gives 1 electron to oxygen atom
Gains 1 electron from oxygen atom
……………. All the following precipitate in chemical reactions except
Hydrogen(1H)
Aluminum(13Al)
Neon(10Ne)
Sodium(11Na)
Number of energy levels in sodium ion is…………than that in sodium atom
Less
more
equal
None of the previous
Ions have……………..in the outermost level
Exactly 4 electrons
More than 4 electrons
Less than 4 electrons
8 electrons