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3 years ago

Which of the following elements possesses the fewest valence electrons? bismuth boron barium bromine

Chemistry

2 answers:

denis-greek [22]3 years ago

6 0

Answer:

The correct answer is barium.

Explanation:

Valence electrons are the electrons present in the valence shell of an atom of an element.

Bismuth has atomic number of 83.

$[Bi]=[Xe]6s^26p^3$

Number of valence electron = 5

Boron has atomic number of 5.

$[B]=[He]2s^22p^1$

Number of valence electron = 3

Barium has atomic number of 56.

$[Ba]=[Xe]6s^2$

Number of valence electron = 2

Bromine has atomic number of 35.

$[Br]=[Ar]4s^24p^5$

Number of valence electron = 7

Barium is one of the element in the given options which possesses fewest number of valence electrons

scZoUnD [109]3 years ago

4 0

Bismuth has 5 valence electrons
Boron has 3 valence electrons
Barium has 2 valence electrons
Bromine has 7 valence electrons

So therefore, the correct answer would be Barium.

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true or false einsteins equation implies that a large amount of mass can be converted into a small amount of energy

77julia77 [94]

the answer t this question is true

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3 years ago

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Of the following reactions occurring at 25ºC, which one involves the greatest increase in entropy?H2(g) + Cl2(g) = 2 HCl(g)H2O(s

SVETLANKA909090 [29]

Answer: [tex]CO_2(s)\rightarrow CO_2(g)[/tex]

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) $H_2(g)+Cl_2(g)\rightarrow 2HCl(g)$

2 molesof gas are converting to 2 moles of another gas , thus $\Delta S$ is zero.

b) $H_2O(s)\rightarrow H_2O(l)$

1 mole of solid is converting to 1 mole of liquid, the randomness increases and thus $\Delta S$ is positive.

b) $Pb^{2+}(aq)+2Cl^-(aq)\rightarrow PbCl_2(s)$

2 moles of ions are converting to 1 mole of solid, the randomness decreases and thus $\Delta S$ is negative

d) $CO_2(s)\rightarrow CO_2(g)$

1 mole of solid is converting to 1 mole of gas, the randomness increases drastically and thus $\Delta S$ is highly positive.

3 0

3 years ago

Since atoms have more than one electron (other than atomic hydrogen) how do you account for the electrons remaining associated w

WARRIOR [948]

Answer: the electrons remain around the atomic nuclei due to the existence of a positive charge on the nuclei that, of course, atract the negative charged electrons. The protons are the paricles in the nuclei that hold the positive charge.

Justification:

First, I wish to explaing the sense of the question. The question arises because given that the electrons have negative electric charge how is that they do not repeal each other to the point that they end leaving the nucleous of the atom alone.

This is you know that equal charges repel each other, so how is it that the electrons stand around the nucleous instead of separateing and levaing the atomic nucleous alone.

The answer is due to the existence of a positive charge on the nuclei that, of course, atract the negative charged electrons. That positive charge is the protons.

The protons are particles in the atomic nuclei that are positive charged and they exert the right attractive force upon the electrons to permit them stay in the orbitals (regions of the space around the nuclei of the atoms where the electrons are found).

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3 years ago

20.0 g of Nitrogen is produced when oxygen gas reacts with NO gas. 29.8 L of oxygen is required at STP to produce this 20.0 g of

fiasKO [112]

The statement is false as 85675 grams of nitrogen dioxide is produced instead of 20 grams.

Explanation:

Balance equation for the reaction:

2NO + $O_{2}$ ⇒ 2N $O_{2}$