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Flauer [41]
3 years ago
9

Carbon has an atomic number of 6. This means it has 6 protons and 6 electrons. How many valence electrons does carbon have?

Chemistry
1 answer:
Varvara68 [4.7K]3 years ago
8 0

Answer:

4

Explanation:

Carbon configuration- 2,4

Valence electrons means the outershell electrons

That means valence electrons=4

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3 years ago
Read 2 more answers
How many Br atoms are in 1.98 g of Br?
Mkey [24]

Answer:

1.5 x 10²²atoms

Explanation:

Given parameters:

Mass of Br = 1.98g

Unknown:

Number of atoms

Solution:

A mole of a substance is the amount of substance contained in the avogadro's number of particles.

To solve this problem, we must first find the number of moles present in the given mass of the Br atom:

       Number of moles = \frac{mass}{molar mass} =  \frac{1.98}{80}  = 0.025mole.

Now we know that:

       1 mole = 6.02 x 10²³

      0.025 mole = 0.025 x 6.02 x 10²³ = 1.5 x 10²²atoms

7 0
3 years ago
Which best describes why it is important for a scientist to use the metric system when recording data?
Andrews [41]

Answer:

Either C or D

Explanation

I would go with C or D I think it is C though it seems like a better choice sorry if im wrong or give a bad answer

8 0
3 years ago
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Lithium-4 and Lithium-5 can be defined as:
Ludmilka [50]

Answer:

A: isotopes

Explanation:

Hello.

In this case, since isotopes are defined as atoms of the same element with the same atomic number (number of protons and electrons) but different mass number (atomic mass) we can represent them via the symbol of the element followed by a dash indicating the atomic mass of the occurring isotope, for instance, for carbon, we may find C-12, C-13 and even C-14 which is useful in dating techniques.

Therefore, Lithium-4 or Li-4 and Lithium-5 or Li-5 can be defined as isotopes.

Best regards.

8 0
3 years ago
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