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Tems11 [23]
3 years ago
11

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

Chemistry
1 answer:
djverab [1.8K]3 years ago
3 0

Answer:

The notation of configuration of Co is [Ar] 3d^7 4s^2

(A) is correct option.

Explanation:

Given that,

The following notations is the correct noble gas configuration for  Co.

(A). [Ar] 3d⁷ 4s²

(B). [Ar] 4s² 4p⁶ 3d

(C). [Kr] 4s² 4p⁶ 4d

(D). [Co] 3d⁷ 4s²

We know that,

Cobalt :

Co is the symbol of cobalt which is a chemical element.

Atomic number of Co is 27.

We need to find the notation of the configuration of  noble gas Co

Using configuration

Co_{27}=2, 8, 15, 2

Co_{27}=1s^2, 2s^2,2p^6, 3s^2 3p^6 3d^7, 4s^2

So, we can write as the notation of noble gas configuration

Co_{27}=[Ar] 3d^7 4s^2

Hence, The notation of configuration of Co is [Ar] 3d^7 4s^2

(A) is correct option.

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Which statements are consistent with Dalton"s atomic theory as it was originally stated? Why? a. Sulfur and oxygen atoms have th
Vlad [161]

The question is incomplete, the complete question is:

Which statements are consistent with Dalton's atomic theory as it was originally stated? Why?

a. Sulfur and oxygen atoms have the same mass.

b. All cobalt atoms are identical.

c. Potassium and chlorine atoms combine in a 1:1 ratio to form potassium chloride.

d. Lead atoms can be converted into gold.

<u>Answer: </u>The correct options are b) and c).

<u>Explanation:</u>

Some of the postulates of Dalton's atomic theory are:

  • All matter is made of very tiny particles called atoms that participate in chemical reactions
  • Atoms are indivisible particles that cannot be created or destroyed in a chemical reaction
  • Atoms of a given element are identical in mass and chemical properties
  • Atoms of different elements have different masses and chemical properties.
  • Atoms combine in the ratio of small whole numbers to form compounds.
  • The relative number and kinds of atoms are constant in a given compound.

For the given options:

<u>For a:</u>

The statement is inconsistent with the theory as no two elements can have the same mass. Only atoms of the same element can have the same mass.

  • <u>For b:</u>

This is consistent with the theory as atoms of the same element are identical.

  • <u>For c: </u>

This is consistent with the theory as atoms combine in a simple whole number ratio.

  • <u>For d:</u>

The statement is inconsistent with the theory as atoms of one element cannot be changed to atoms of other element.

Hence, the correct options are b) and c).

5 0
3 years ago
How many significant figures are in the number 020.310
True [87]

Answer:

5

Explanation:

Sorry, don't have one

<u><em>Hope this helps and I get brainliest <3</em></u>

6 0
3 years ago
With white light, a team measured a 0.7% percent change with 3.5g of plant matter in a one liter container. Convert
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moles CO₂ = 5.57.10⁻⁴

<h3>Further explanation   </h3>

A mole is a number of particles(atoms, molecules, ions)  in a substance

Can be formulated :

\tt mol=\dfrac{mass}{MW}

0.7% percent change with 3.5g of plant matter

mass :

\tt 0.7\%\times 3.5~g=0.0245~g

moles :

\tt moles=\dfrac{0.0245}{44}=0.000557=5.57.10^{-4}

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3 years ago
Identifying the Reddish-Brown Substance (continued)
antiseptic1488 [7]

Here's link to the answer:

tinyurl.com/wpazsebu

4 0
3 years ago
If after heating the reaction between magnesium and hydrochloric acid, the mass of the magnesium chloride and beaker is measured
Allushta [10]

Since the beaker was heated we can asume that only magnesium cloride is left in the beaker, therfore the difference between the beaker with magnesium chloride and the empty beaker give the mass of magnisium chloride:

\text{mass MgCl}_2=massbeakerwithMgCl_2-mass\text{ emprty beaker =37.83 g - 33.95g = 3.8}8g

7 0
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