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koban [17]
2 years ago
11

Select the correct answer. What happens when an electron absorbs energy? A. The electron moves from a lower energy orbital to a

higher energy orbital. B. The electron falls into the nucleus. C. The electron moves from a higher energy orbital to a lower energy orbital. D. The electron loses its charge.
Chemistry
1 answer:
umka2103 [35]2 years ago
3 0
I choose the option A.
The electron absorbs energy from specific wavelength then moving from a lower energy orbital to a higher energy orbital.
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A chemist wants to combine sodium with a halogen. The halogen must have a higher atomic mass than sodium. Which of the following
user100 [1]

Answer:

bromine

Explanation:

i just know

8 0
3 years ago
A newly discovered element, Z, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267
blsea [12.9K]
atomic mass=percentage of isotope a * mass of  isotope a + percentage of isotope b * mass of  isotope b+...+percentage of isotope n * mass of isotope n.

Data:
mass of isotope₁=267.8 u
percentage of isotope₁=90.3%

mass of isotope₂=270.9 u
percentage of isotope₂=9.7%

Therefore:

atomic mass=(0.903)(267.8 u)+(0.097)(270.9 u)=
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Answer: the mass atomic of this element would be 268.1 u
7 0
3 years ago
When a candle is cooling down is it a physical or chemical change
Ksivusya [100]
Physical

When something is cooling it isn’t changing it’s chemical composition so it’s physical
3 0
3 years ago
Read 2 more answers
Anyone else board answer for free points
Dovator [93]
You spelled bored wrong lol
3 0
3 years ago
Read 2 more answers
What is Darwin's name for species that do not appear to have changed for millions of years?
ioda

Since, the options have not been given the question is incomplete.

What is Darwin's name for species that do not appear to have changed for millions of years?

a.

Dinosaurs

b.

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c.

Old souls

d.

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Answer: b. Living fossil

Explanation:

In 1859 Charles Darwin proposed the term living fossil, that means a species or group of species that had not changed in terms of evolutionary context thus can be useful in tracing the extinct or previously existing forms of life. The examples of the living fossils are horseshoe crabs, ginkgo (Conifers) and tuatara. These group of animals were existed unchanged in the Ordovician, Permian, and Triassic periods respectively with few surviving species.

4 0
3 years ago
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