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3 years ago

Which element is the total number of valence electrons in an atom with a total of 13 protons

Chemistry

1 answer:

Musya8 [376]3 years ago

6 0

Answer:

This is Aluminium.

3 Valency electrons.

Explanation:

The atomic number is 13 and the electronic configuration is

1s22s22p63s23p1 . This is Aluminium.

It has 3 valency electrons. (3s23p1).

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4 years ago

28. After 3 substances are mixed, an odor emits

Lyrx [107]

Answer:

a. chemical change

Explanation:

A chemical change can cause an odor, however a physical change cannot, and the use of thermal energy will only make an object colder, not give it an odor.

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3 years ago

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Which of the following is a structure of a cow?

AfilCa [17]

Answer:

None of the above.

Explanation:

None of thesse things are part of the structure of a cow, cows have dished forhead 4 stomachs and angular body not sharp teeth comin when called or hooved feet.

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3 years ago

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

lisov135 [29]

Example :

$2FeCl_3_{(aq)}+2KI_{(aq)}=2FeCl2_{(aq)}+2KCl_{(aq)}+I_2_{(s)}$

If you use the subscript (aq) (=aquaris) , this means that the substance is in a solution.

Subscripts:
-aq-this means that the substance is in a solution
-s-this means that the substance is a solid(or precipitate)
-l-this means that the substance is a liquid
-g-this means that the subtance is a gas

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3 years ago

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How many significant figures does the following number contain: 385.01

dusya [7]

Answer:

5 significant figures

Explanation:

Zeros that come before any non-zero digits are never significant.

Zeros that are in between any non-zero digits are always significant.

Zeros that come after any non-zero digit are ONLY significant if a decimal point in present somewhere in the number. (In this case there is a decimal point, but there aren't any zeros at the end of this number.)

I have underlined the significant figures in this number:

3 8 5 . 0 1

3 0

4 years ago