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masya89 [10]
3 years ago
7

If a substance cannot be seperated physically or chemically, it is ?

Chemistry
1 answer:
Dmitrij [34]3 years ago
4 0

Then it is a pure substance, or an element.

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Cuales elementos tienen solo un electrón de valencia ​
aleksley [76]

Answer:

En el caso del sodio, la valencia es 1, ya que tiene un solo electrón de valencia, si pierde un electrón se queda con el último nivel completo.

Explanation:

Grupo de la tabla periódica Electrones de valencia

Grupo 14 (IV) (Grupo del carbono) 4

Grupo 15 (V) (Grupo del nitrógeno ) 5

6 0
3 years ago
Please help! Willing to offer Brainliest. :D
Luda [366]

Answer:

The correct answer is beta decay

Explanation:

When a beta particle is emitted from a radioactive atom,at that time the daughter atom that is produced have atomic mass 1 unit more than that of its parental atom.

 In the given reaction a beta particle is emitted from the carbon atom resulting in the formation nitrogen atom,The atomic mass of nitrogen atom is 7dalton which is one unit more than the atomic mass of carbon that is 6 dalton.

       

4 0
3 years ago
Which of the following presented the first alteration of natural resources?
AURORKA [14]
I believe it is Industry
5 0
4 years ago
Read 2 more answers
When Na forms an ion it loses its outer electron to become Na+. Write the electron configuration for Na and Na+. What element do
Otrada [13]

Answer:

Na: 1s2 2s2 2p6 3s1

Na+: 1s2 2s2 2p6

Na+ electronic configuration resemble that of Neon( 1s2 2s2 2p6)

In general, the electronic configuration of alkali metals ions resemble that of the group zero (noble gas)

3 0
4 years ago
Find the number of atom in 1.50g of c
Aleonysh [2.5K]
Atomic mass Carbon (C ) = 12.01 a.m.u

12.01 g ---------- 6.02x10²³ atoms
1.50 g ----------- ??

1.50 x ( 6.02x10²³ ) / 12.01 =

7.51x10²² atoms of C

hope this helps!

6 0
3 years ago
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