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OLga [1]
3 years ago
15

Which of the following notations is the correct noble gas configuration for

Chemistry
1 answer:
Setler79 [48]3 years ago
5 0

Answer:

Option B. [Ar] 4s² 3d⁷

Explanation:

The condensed form of the electronic configuration of of cobalt, Co can be written by using the closest noble gas element before the cobalt element.

Cobalt has atomic number of 27. The noble gas element before cobalt is argon (Ar).

Thus, we can write the electronic configuration of cobalt, Co as follow

Co (27) => [Ar] 4s²3d⁷

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lora16 [44]
Hey there!:


density  = 3.51 g/cm³

Volume = 0.0270 cm³

Therefore:

D = m / V

3.51 = m / 0.0270

m = 3.51 * 0.0270

m = 0.09477 g 
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Aluminum is an element. Which best describes what makes up a sample of aluminum?
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3 years ago
Compared to the charge of a proton the charge of an electron has
mart [117]

Answer:

Compared to the charge of proton the charge of an electron is negative.

Explanation:

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All these three subatomic particles construct an atom. 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. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

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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.

Neutron and proton

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Mass of neutron=1.674929×10-27 Kg

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4 years ago
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