CHEMISTRY HIGH SCHOOL

The atomic mass of an element can be approximated by adding the number of _______ plus the average number of _______.A. protons; electrons

B. protons; neutrons

C. neutrons; electrons

Answers

Answer 1
Answer:

Answer: Option (B) is the correct answer.

Explanation:

Atomic mass is defined as the summation of total number of protons and neutrons present in an element.

On the other hand, atomic number means the total number of protons present in an element.

For example, atomic number of sodium is 11 and number of neutrons present in it are 12.

Hence, atomic mass of sodium = no. of protons + no. of neutrons

                                                    = (11 + 12) amu

                                                    = 23 amu

Therefore, we can conclude that the atomic mass of an element can be approximated by adding the number of protons plus the average number of neutrons.
Answer 2
Answer: by adding number of protons and neutrons

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An article about half-lives describes a daughter isotope. What is a daughter isotope?

Answers

A daughter isotope is a part of the decay chain process in which the parent isotope undergoes the decaying process in the nuclear reaction and as a result, it forms daughter isotopes. Daughter isotopes can also have their own daughter isotopes if they want.

The answer should be A, the daughter isotope is the isotope formed from the less stable one (parent)


hope this helps :)

Which element is a solid at STP?
A. H2
B. I2
C. N2
D. O2

Answers

An element which is solid at STP that is standard temperature and pressure is iodine.

What is an element?

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Elements combine to form compounds.

Learn more about element,here:

brainly.com/question/14347616

#SPJ2
B. I2, di-Iodine, is solid at STP.

what happens during vaporization and evaporation?

Answers

with vaporization, think of hot water, at a point it starts to boil and steam is created. that's water vapor then it dissipates.  With evaporation, think of rain, whewn it rains, the grouns doesn't soak it all up, It goes through the cycle. clouds, rain, evaporation, clouds again. does that make scene?

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?

Answers

The atom of alkaline earth metal has one more proton and one more electron than the alkali metal that is next to it to the left on the periodic table. Then the atomic number of the alkali metal is one unit less than the atomic number of the alkaline earth metal next to it.

What principle do Tesla coils use to generate electricity?

Answers

Electromagnetic
Hope this helps!
when u give supply to a coil then a current will be passed through it . 
naturally a magnetic field is produced around the c.c.c(current carrying conductor). when u make more turns in the same direction the whole magnetic field will be stronger than that of a wire has. and 
by lenz's law there will be an opposition to the changing current in a coil due to the change in magnetic field produced

Einstein’s Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is a constant.Which of the following statements explains why this is considered to be a scientific theory?

Scientists believe it is the best explanation because it is built on data and observations.

The majority of the scientific community voted on this theory over other possible explanations.

It is the best explanation because it supports the beliefs and opinions of most scientists.

It is a scientific law that has been supported by experimental data.

Answers

Einstein’s Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is aconstant. The statement that explains why this is considered to be a scientific theory is that the majority of the scientific community voted on this theory over other possible explanations.

Answer:

The correct answer will be option-It is the best explanation because it supports the beliefs and opinions of most scientists.

Explanation:

Albert Einstein is known for his theory of relativity which states that energy is a converted form of mass to the square of the speed of light which is constant.

Albert Einstein was a theoretical physicist who used the facts and data from the papers of the previous physicist. Although he used the facts his theory became one of the important theory in the physics world as it explained the path of the light and the form in which it travels.

This theory is well accepted today as it was supported by the experiments and observation of the other works of different scientist. This led to the acceptance of the theory worldwide.

Thus, the selected option is the correct answer.
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