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Stells [14]
2 years ago
8

An atom of which of these elements most likely forms an anion? A. AI B. Br C. Ca D. Mg

Chemistry
2 answers:
statuscvo [17]2 years ago
8 0
Bromine because it has seven electrons in its outer shell. This means that it needs to gain an electron in order to have a full outershell (eight electrons). A negative ion is called an anion.
Contact [7]2 years ago
4 0

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

Anions is the negatively charged ion which is formed when an element gains electrons.

Cations are the positively charges ions which is formed when an element looses electrons.

From the given options:

<u>Option A:</u>  Aluminium (Al)

Aluminium is the 13th element of the periodic table having electronic configuration of 1s^22s^22p^63s^23p^1

This element will loose 3 electrons and will form Al^{3+} ion known as cation.

<u>Option B:</u>  Bromine (Br)

Bromine is the 35th element of the periodic table having electronic configuration of [Ar]3d^{10}4s^24p^5

This element will gain 1 electron and will form Br^- ion known as anion.

<u>Option C:</u>  Calcium (Ca)

Calcium is the 20th element of the periodic table having electronic configuration of [Ar]4s^2

This element will loose 2 electrons and will form Ca^{2+} ion known as cation.

<u>Option D:</u>  Magnesium (Mg)

Magnesium is the 12th element of the periodic table having electronic configuration of 1s^22s^22p^63s^2

This element will loose 2 electrons and will form Mg^{2+} ion known as cation.

From the above information, the correct answer is Option B.

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All of the following are true except foreshocks can happen before an earthquake aftershocks can happen after an earthquake fores
Snowcat [4.5K]
Foreshocks and aftershocks can happen at the same time is not true. 
4 0
2 years ago
an atom has a charge of -3 in its orbitals which statement must be true in order for this atom to have no net charge
NISA [10]

Answer:

The atom must lose its three extra electrons to make the atom over all neutral.

Explanation:

The three subatomic particles construct an atom electron, proton and neutron. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons.

If an atom have -3 charge it means three more electrons are added. In order to make the atom overall neutral three more electrons must be removed so that negative and positive charge becomes equal and cancel the effect of each other and make the atom neutral.

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e⁻

Mass= 9.10938356×10⁻³¹ Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

Proton and neutron:

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P⁺

Symbol of neutron= n⁰

Mass of proton=1.672623×10⁻²⁷ Kg

Mass of neutron=1.674929×10⁻²⁷ Kg

7 0
3 years ago
4. Determine what elements are in the following compounds.
lilavasa [31]
Nitrogen=2, Hydrogen=8, Carbon=1, Oxygen=3

Hydrogen=4, Carbon=2, Oxygen=2

Iron=1, Nitrogen=2, Oxygen=6
8 0
3 years ago
A brown dye has a percent composition of 62.41% C, 5.24% H, and 32.36% N by mass with a molar mass of 346.40 g/mol. Determine th
Fiesta28 [93]

The molecular formula : C₁₈H₁₈N₈

<h3>Further explanation</h3>

Given

62.41% C, 5.24% H, and 32.36% N

Required

The molecular formula

Solution

mol ratio

C : 62.41/12.0096 = 5.1967

H : 5.24/1.00784 = 5.1992

N : 32.36/14.0067 = 2.310

Divide by 2.310(smallest)

C : 5.1967/2.31=2.25

H : 5.1992/2.31 = 2.25

N : 2.31/2.31 = 1

Multiplied by 4

C : H : N = 9 : 9 : 4

The empirical formula : C₉H₉N₄

(C₉H₉N₄)n=346.40 g/mol

(12.0096 x 9 + 1.00784 x 9 + 14.0067 x 4)n=346.4

(108.0864+9.07056+56.0268)n=346.4

(173.184)n=346.4

n=2

<em>The molecular formula : C₁₈H₁₈N₈</em>

8 0
2 years ago
In a constant‑pressure calorimeter, 70.0 mL of 0.350 M Ba(OH)2 was added to 70.0 mL of 0.700 M HCl. The reaction caused the temp
DanielleElmas [232]

<u>Answer:</u> The amount of heat absorbed by the solution is 2.795 kJ

<u>Explanation:</u>

To calculate the mass of water, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

Density of water = 1 g/mL

Volume of water = [70 + 70] = 140 mL

Putting values in above equation, we get:

1g/mL=\frac{\text{Mass of water}}{140mL}\\\\\text{Mass of water}=(1g/mL\times 140mL)=140g

To calculate the heat absorbed, we use the equation:

q=mc\Delta T

where,

q = heat absorbed

m = mass of water = 140 g

c = heat capacity of water = 4.186 J/g°C

\Delta T = change in temperature = T_2-T_1=(28.74-23.97)^oC=4.77^oC

Putting values in above equation, we get:

q=140g\times 4.186J/g^oC\times 4.77^oC=2795.4J=2.795kJ

Hence, the amount of heat absorbed by the solution is 2.795 kJ

3 0
2 years ago
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