1)All of the following elements can form positive ions , except.........
Unit 1 prep 1

Quiz
•
Science
•
7th Grade
•
Hard
Walaa Reda
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
a-sodium(11Na)
b-chlorine(17Cl)
c-magnesium(12Mg)
d-aluminium(13Al)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2)The number of energy levels in sodium ion is .......the number of energy levels in its atom.
a-less than
b- more than
c-equal to
d-no correct answer
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
3)when an atom is changed into an ion ,the ......is changed.
a-number of protons
b-number of electrons
c-number of neutrons
d-mass number
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4)During the chemical reaction,a magnesium atom(12Mg)loses its outer electrons and changes into ......
a-Mg+
b-Mg -
c-Mg+2
d-Mg -2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
5)In trivalent elements ,the outrmost energy level contains....... electrons.
a-(5) or(3)
b-(7) or(1)
c-(6) or (3(
d-(5)or(6)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
6)The valency of copper in(Cu2O) is ....
a-monovalent
b-divalent
c-trivalent
d-tetravalent
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
7)Which of the following is a trivalent atomic number?
a-Hydroxide
b-Sulphate
c-Ammonium
d-Phosphate
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