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2 years ago

Which species does not have a noble gas electron

Chemistry

2 answers:

Inessa [10]2 years ago

8 0

Noble gases are elements with complete octet configuration

this means their outershells are complete with 8 electrons

other elements have incompletely filled outershells therefore they either lose or gain electrons to gain a complete octet in the outershell

1. Na⁺ - Na electron configuration is 2,8,1

positive charge means it loses its outermost shell electron and becomes 2,8 with 8 electrons in the outermost shell

therefore has a noble gas configuration

2.Mg²⁺ - Mg electron configuration is 2,8,2

2 plus means Mg loses 2 electrons in the outermost shell and becomes 2,8 and has 8 electrons in the outer energy shell

therefore has a noble gas configuration

3.Ar - Ar electron configuration is 2,8,8

Ar has 8 electrons in the outermost energy shell therefore its complete

Ar element is a noble gas

4.S - S electron configuration is 2,8,6

S has 6 electrons in the outermost energy

therefore it does not have a noble gas configuration

correct answer is 4) S

lara31 [8.8K]2 years ago

6 0

S, sulfur does not have a noble gas electron.

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If a penny is made of 3.11 grams of copper, how many atoms of copper are in the penny

Pie

Answer:

2.94x10²² atoms of Cu

Explanation:

We must work with NA to solve this, where NA is the number of Avogadro, number of particles of 1 mol of anything.

Molar mass Cu = 63.55 g/mol

Mass / Molar mass = Mol → 3.11 g / 63.55 g/m = 0.0489 moles

1 mol of Cu has 6.02x10²³ atoms of Cu

0.0489 moles of Cu, will have (0.0489 .NA)/ 1 = 2.94x10²² atoms of Cu

8 0

2 years ago

Acetaldehyde shows two UV bands, one with a lmax of 289 nm ( 5 12) and one with a lmax of 182 nm ( 5 10,000). Which is the n p*

UkoKoshka [18]

Answer:

The bands are due to:

λmax = 289 nm n→π* transition (E = 12)

λmax = 182 nm π→π* transition (E=10000)

Explanation:

The two types of acetaldehyde transition are as follows:

n→π* and π→π*

From the attached diagram we have to:

ΔEn→π* < ΔEπ→π*

ΔEα(1/λ)

Thus:

λn→π* > λπ→π*

In n→π* spin forbidden, the intensity is low. Thus, the molar extinction E for n→π* is very low.

The same way, for π→π* spin allowed the intensity is high. Thus, the molar extinction coefficient E for π→π* is high too.

The bands are due to:

λmax = 289 nm n→π* transition (E = 12)

λmax = 182 nm π→π* transition (E=10000)

5 0

2 years ago

Turbo the snail moves across the ground at a pace of 12 feet per day. If the garden is 48 feet away, how many days will it take

katen-ka-za [31]

Answer:4 days will it take for the snail to get to the garden.

Explanation:

Speed of the snail = 12 feet per day:

Distance between the garden and snail = 48 feet

$Speed=\frac{Distance}{Time}$

$Time=\frac{48 feet}{12 \text{feet per day}}=4 days$

4 days will it take for the snail to get to the garden.

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2 years ago

For lunch, a patient consumed 3 oz of skinless chicken, 3 oz of broccoli, 1 medium apple, and 1 cup of nonfat milk (see Table 3.

Volgvan

Lunch of a patient has 3 oz skinless chicken, 3 oz of broccoli, 1 medium apple, and 1 cup of nonfat milk

Energy content of 3 oz skinless chicken is = 110 kcal

Energy content of 3 oz broccoli = 30 kcal

Energy content of 1 medium apple = 60 kcal

Energy content of 1 cup non-fat milk = 90 kcal

So the kilocalories of energy patient obtained from lunch

= 110 kcal+ 30 kcal + 60 kcal + 90 kcal = 290 kcal

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2 years ago

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AveGali [126]

The answer is C). PH3

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2 years ago

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