Science CUP

Science CUP

7th Grade

10 Qs

quiz-placeholder

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Science CUP

Science CUP

Assessment

Quiz

Science

7th Grade

Medium

Created by

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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