1) Isotopes of the same element must have the same number of: a) protons. b) ele

Question

1) Isotopes of the same element must have the same number of:
a) protons.
b) electrons.
c) None of the answers
d) neutrons.

2) Isotopes of the same element must have different numbers of:
a )protons.
b) neutrons.
c) None of the answers
d) electrons.

3)An ion with 7+ charge contains 18 electrons. Which ion is it.
a) Vanadium.
b) Iron.

c) Chromium.

d) Cobalt.
e) Manganese.

4)For H2SO4 (i.e. sulfuric acid). What is the total number of valence electrons?

a)36
b) 30
c) 28
d) 34
e) 32

5) A atom of 37Cl-3 has:
a)17 protons, 37 neutrons, and 17 electrons
b)17 protons, 20 neutrons, and 20 electrons.
c)37 protons, 37 neutrons, and 37 electrons.
d) 17 protons, 20 neutrons, and 37 electrons

6)An ion with 7- charge contains 30 electrons. Which ion is it.
a)Vanadium.
b) Manganese.
c) Chromium.
d)Cobalt.
e) Iron.

Explanation / Answer

1)
isotopes contain equal numbers of protons but different numbers of neutrons
Answer: a)protons

2)
Answer: b)neutrons

3)
7 + charge means 7 electron have been removed
atomic number = 18+7 = 25
It is manganese
Answer: e) Manganese.

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