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Butoxors [25]
3 years ago
9

Which statement accurately describes the atoms of a specific element?

Chemistry
2 answers:
s2008m [1.1K]3 years ago
5 0

Answer: the correct answer is 100% B.  scandium‚ Sc‚ atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.  just took the test and got it right

katrin2010 [14]3 years ago
4 0

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

<u>Explanation:</u>

Atomic number is defined as the number of electrons or number of protons that are present in a neutral atom. It is represented as Z.

Z = Atomic number = Number of electrons = Number of protons

Mass number is defined as the sum of number of protons and number of neutrons present in an atom. It is represented as A.

A = Mass number = Number of protons + Number of neutrons

Number of neutrons = Mass number - Atomic number

For the given options:

  • <u>Option A:</u>

Indium is the 49th element of the periodic table having mass number 115.

So, Number of protons = Number of electrons = 49

Number of neutrons = 115 - 49 = 66

Hence, this is not correctly described.

  • <u>Option B:</u>

Scandium is the 21st element of the periodic table having mass number 45

So, Number of protons = Number of electrons = 21

Number of neutrons = 45 - 21 = 24

Hence, this is not correctly described.

  • <u>Option C:</u>

Aluminium is the 13th element of the periodic table having mass number 27

So, Number of protons = Number of electrons = 13

Number of neutrons = 27 - 13 = 14

Hence, this is not correctly described.

  • <u>Option D:</u>

Zinc is the 30th element of the periodic table.

So, Number of protons = Number of electrons = 30

This atom has 30 protons inside the nucleus and 30 electrons outside the nucleus.

Hence, this is correctly described.

Thus, the correct answer is Option D.

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A 10.0-g sample of sodium chloride was placed in 10.0 g of water. If 3.85 g of Cl2 was obtained, what was the percent yield of C
suter [353]

Answer:

63.53% yield

Explanation:

The balanced equation for this reaction is 2NaCl + H2O -> 2NaOH +Cl2

First we must find the limiting reactant

From NaCl we can only produce 6.06 grams of Cl2 in <u>theory</u>

From H20 we can only produce 38.995 grams in theory

so we know NaCl is the limiting

% yield is (Actual/Theoretical) x100 so

(3.85/6.06)x100= 63.53% yield

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2 years ago
Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?
Juli2301 [7.4K]

Answer:

B. They both contain three atoms around the central atom.

Explanation:

Do the unit test on edg20 and got it right!

7 0
3 years ago
Which state of matter has atomic spacing that is close together and definite shape? gas liquid solid plasma none of the above
den301095 [7]

Answer: solid

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5 0
3 years ago
1Which is a dopant for a p-type semiconductor?
aalyn [17]

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Al , B, Ga, In Tl

So the correct element will be In : Indium

The other elements belongs to 15th group and hence will give n type semiconductor


5 0
3 years ago
Read 2 more answers
A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon di
Phoenix [80]

Physical and chemical changes are reversible and nonreversible changes. The release of carbon dioxide gas indicates a chemical change.

<h3>What is a chemical change?</h3>

A chemical change is a change in which a new substance is produced when the reactants react in the reaction mixture. The chemical produced cannot be reversed back to the reactants and hence, it is nonreversible.

The release of carbon dioxide is a chemical change as limestone and hydrochloric acid react with each other chemically and as a result, a new substance was formed.

Therefore, the production of carbon dioxide indicates a chemical change.

Learn more about chemical change here:

brainly.com/question/23693316

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5 0
2 years ago
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