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Daniel [21]
4 years ago
11

Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese

Chemistry
2 answers:
Leno4ka [110]4 years ago
8 0

Answer:

Krypton

Explanation:

Maksim231197 [3]4 years ago
5 0
The element from those four that is a noble gas is krypton. 
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This represents the composition of a substance expressed as a percent.
meriva

Answer:percent composition

Explanation:

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3 years ago
What is the chemical formula for the compound ammonium phosphate? Use the list of polyatomic ions and the periodic table to help
Talja [164]

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

<u>Explanation:</u>

We are given some polyatomic ions with their oxidation states. Polyatomic ions are defined as the ions which are formed from more than 2 atoms.

We need to find out the chemical formula for ammonium phosphate.

For this, the polyatomic ions used are:

Ammonium ion - NH_4^+

Phosphate ion - PO_4^{3-}

By using criss-cross method, the oxidation state of the ions are exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

Thus, the chemical formula for this compound is (NH_4)_3PO_4

Hence, the correct answer is Option C.

4 0
4 years ago
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Si el número atómico del Flúor es 9 y su masa atómica 19, ¿cuántos electrones, protones y neutrones, tiene? Justifique con formu
ValentinkaMS [17]

La respuesta correcta es  e) 9, 9 y 10

Explicación:

En general, la composición de los átomos incluye electrones (carga negativa), protones (carga positiva) y neutrones (carga neutra). Además, la masa atómica se refiere al número en conjunto de neutrones y protones, mientras que el número atómico define el número de protones. Es decir que masa atómica = número de protones o número atómico más de número de electrones. Además, en un átomo de carga neutra el número de electrones y protones es neutra.

De acuerdo a esto, número de protones o número atómico + número de neutrones = masa atómica

9 (número de protones) + número de neutrones = 19 (masa atómica)

número de neutrones = 19 (masa atómica) - 9 (número de protones)

número de neutrones = 10

Además, el número de protones = número de electrones por lo que 9 protones significa que hay 9 electrones

Es decir, que el número de electrones es 9, el número protones es 9, y el número de neutrones es 10

5 0
4 years ago
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OleMash [197]
467.5 centimeters. are you sure that's high school chemistry though, lad? 
7 0
3 years ago
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Light energy comes from
Travka [436]

Answer:

The sun

Explanation:

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3 years ago
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