Science CUP

Quiz
•
Science
•
7th Grade
•
Medium
Mr.Hatem Ibrahim
Used 35+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Give reasons The number of electrons of an ion differs from that of its atom.
Because the number of electrons in ion is less than or more than its number in the same atom by the number of lost or gained electrons.
Because it arises by sharing each nitrogen atom with three electrons to complete its outermost shell with 8 electrons and becomes more stable
Because sodium ion is formed when sodium atom loses one electron and changes
while covalent bond arises between two similar or different nonmetal
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
The number of known elements up till now is elements.
92
118
121
181
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When an atom is changed into an ion, the..............
is changed.
number of protons
number of neutrons
number of electrons
mass number
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A lithium atom (Li) changes into a lithium ion (Li +), which mean that it................
gains one proton.
gains one electron.
loses one proton.
loses one electron
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The only nonmetal that exists in a liquid state is.....................
bromine,
chlorine.
hydrogen.
nitrogen.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The number of electrons in oxygen ion (0-2) is......................... electrons.
6
8
10
12
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The number of......................... determines the type of element and its chemical activity.
electrons in the outermost energy level
levels filled with electrons
neutrons
protons
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