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SashulF [63]
3 years ago
13

Which is not a formula for a diatomic molecule? N2 O3 He

Chemistry
2 answers:
Sergeu [11.5K]3 years ago
7 0
He because nitrogen and ozone is a molecule but helium is atom
frez [133]3 years ago
7 0

<u>Ans: Thus, O3 and He are not the formulas for diatomic. Only N2 is a diatomic</u>

A monatomic system consists of only a single element

A diatomic system consists of two elements

A polyatomic systems consists of more that two elements

1) N2: nitrogen molecule is composed of 2 N atoms. Hence it is a diatomic

2) O3: ozone is composed on 3 O atoms. Hence it is a triatomic (polyatomic)

3) He: Helium is  simply a monatomic

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3 years ago
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kap26 [50]

Answer:

a) _{31}^{71}\textrm {P^{3+}}

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Explanation:

For neutral atoms:

Atomic Number (Z)= number of protons = number of electrons

Mass number (A) = number of protons + number of neutrons

For ions with positive net charge:

Number of protons = Z + net charge

For ions with negative net charge:

Number of protons= Z - net charge

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Number of protons = 28 +3 =31

_{31}^{71}\textrm {P^{3+}}

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Number of neutrons = 45

Number of electrons = 36

Charge = Number of protons- Number of electrons =35-36 = -1

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Number of protons = Z = 86+4 = 90

mass number = A = 90+142 = 232

_{90}^{232}\textrm {Th^{4+}}

d)  Charge = +2

Atomic number = Number of protons = Z = 38

mass number = A = 87

_{38}^{87}\textrm {Sr^{2+}}

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