WorksheetsY7 Chem BT 7_2 Atomic Notation & Chemical Formula
Total questions: 25
Worksheet time: 56mins
When electron jumps from higher energy level to lower energy level:
- Energy is emitted
When an electron jumps from a lower energy level to higher energy level:
- Energy is absorbed
When electron jumps from higher energy level to lower energy level:
- E............ is e............
When an electron jumps from a lower energy level to higher energy level:
- E.................. is a..............
Isotopes means same number of protons & electrons but different numbers of neutrons
Isotopes means ......................
(2 answers)
same number of photons & electrons
same number of neutrons
same number of protons & electrons
different number of neutrons
In an ionic compound, after Combination, the molecules remains neutral:
- the two electrically charged ions balance each other.
In an ionic compound, after Combination, the molecules remains neutral:
What is the correct word equation for the following reaction.
nitric acid react with potassium hydroxide to produce ________ and water
potassium sulfate
potassium oxide
potassium nitrate
nitric hydroxide
Atomic number is 12 , the valency of Magnesium is 2 : Reason:
Magnesium with the atomic number 12 has the electronic configuration (2.8.2).
It lose 2 electrons to become electronic configuration (2.8),
It has complete outer Octet
Atomic number is 12 , the valency of Magnesium is 2 : Reason:
Magnesium with the atomic number 12 has the e................. con........... of (2. . ).
It lose 2 electrons to become electronic configuration of (. . ),
It has complete outer O............
When atoms accepts electrons, it lose its
neutrality
protons
electrons
neutrons
When atoms accepts electrons, it acquires ( taken) a
charge
protons
money
neutrons
an atom, molecule, or ion that has at least one unpaired valence electron is called :
root
radical
element
compound
A .............. is a group of different elements that work together and carries a charge
root
radical
element
compound
A radical cannot exist independently
false
TRUE
sometime
maybe
Atoms cannot be ...... or .......
eaten or swallowed
created or destroyed
love or like
heated or cooled
Atomic notation of Potassium
zinc reacts with sulphuric acid to yield a zinc sulfate and hydrogen gas
zinc + sulphuric acid → zinc sulfate + hydrogen
zinc + sulphuric → zinc sulfate + hydrogen
zinc + sulphuric acid → zinc sulfate + nitrogen gas
zinc + sulphuric acid → zinc sulfide + hydrogen
....................... atoms have incomplete outermost shell
Phycally inactive
Physically active
Chemically inactive
Chemically active
divalent elements are elements with ..... valency
2
1
3
0
Atoms cannot be ...... or .......
Trivalent elements are elements with ..... valency
2
1
3
0
Monovalent elements are elements with ..... valency
2
1
3
0
John Dalton staes that atoms cannot be c............., d..................... or tras..............
created
cured
destroyed
transformed
Metalic atoms l (a) electrons to become cations
Non-metalic atoms g (a) electrons to become anions
