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3 years ago

Which of the following contains an atom that does not obey the octet rule? BrF3 SiO2 NaCl BrF

Chemistry

2 answers:

mario62 [17]3 years ago

6 0

Answer:

BrF₃

Explanation:

Octet rule -

Octet rules determines the stability of an atom , depending on the number and arrangement of atoms .

The atoms with eight electrons are considered to be following the octet rule , are are stable .

The atoms with atoms less than or more than 8 are considered to be unstable and violating the octet rule .

from the given options in the question , BrF₃ violates the octet rule , as it has only 6 electrons .

mrs_skeptik [129]3 years ago

5 0

The octet rule signifies towards the capability of the atoms to prefer to exhibit eight electrons in the valence shell. In case, when the atoms possess lesser than eight electrons, they seem to react and produce more stable components. While discussing octet rule, one does not consider d or f electrons.

According to the octet rule, the atoms of the prime-group elements seem to bind in such a manner that each atom exhibit eight electrons in its valence shell, providing it the similar electronic configuration as a noble gas.

In the given question, in BrF3, fluorine follows octet rule, while bromine does not follow the octet rule.

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A balloon filled with helium has a volume of 6.9 L. What is the mass, in grams, of helium in the balloon?

balandron [24]

Answer : The mass of helium gas in the balloon is, 1.23 grams.

Explanation : Given,

Volume of helium gas = 6.9 L

First we have to calculate moles of helium gas at STP.

As we know that, 1 mole of substance occupy 22.4 L volume of gas.

As, 22.4 L volume of helium gas present in 1 mole of helium

So, 6.9 L volume of helium gas present in $\frac{6.9L}{22.4L}\times 1mole=0.308mole$ of helium

Now we have to calculate the mass of helium gas.

$\text{Mass of He gas}=\text{Moles of He gas}\times \text{Molar mass of He gas}$

Molar mass of He gas = 4 g/mol

$\text{Mass of He gas}=0.308mol\times 4g/mol=1.23g$

Thus, the mass of helium gas in the balloon is, 1.23 grams.

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3 years ago

(45 pts) In which reaction is carbon reduced?

Sidana [21]

Answer:

Reductio is gain of electrons, while oxdation is loss. The oxidtion states of carbon in the reaction will show either of oxidation or reduction occurrence.

$C_{2} H_{2}(g) +H_{2} (g)$ → $C_{2} H_{4}(g)$

Explanation:

Electrons displacement is explained for each reaction below:

+2 to +4 = loss of 2 more lectrons-------oxidation
+4 throughout reaction----no exchange of electrons
-4 to +4 = loss of 4 electrons-----oxidation
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3 years ago

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Luden [163]

Answer:

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Explanation:

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3 years ago

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Which of the following types of electromagnetic waves generally has the least energy

sertanlavr [38]

Radio waves have the lowest energy, but the longest wavelength. So radio waves is the answer. Good luck on the rest and message me for more help.

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3 years ago

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Without consulting any tables, arrange the following substances in order and explain your choice of order: (a) Mg21, Ar, Br2, Ca

Olenka [21]

Explanation:

(a) When we move across a period then there occurs a decrease in atomic size of the elements due to increase in force of attraction between the protons and electrons of an atom.

On the other hand, when we move down a group then there will occur an increase in atomic size of the elements due to increase in number of electrons which will also increase number of shells.

For example, Mg and Ca are group 2 elements, Br is a group 17 element and Ar is a group 18 element.

Hence, these are arranged in order of increasing radius as Ar < Br < Mg < Ca.

(b) Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.

Hence, order of increasing ionization energy for the given species is as follows.

Na < O < $Na^{+}$ = Ne

(c) Electronegativity is defined as the ability of an atom to attract electrons towards itself. When we move across a period then there occurs an increase in electronegativity of the atoms.

And, when we move down a group then there occurs a decrease in electronegativity of the atoms.

Therefore, for the given elements order of increasing electronegativity is as follows.

Al < H < O F

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3 years ago