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alekssr [168]
3 years ago
6

What percentage of atoms in the entire universe are hydrogen atoms?

Chemistry
1 answer:
lisabon 2012 [21]3 years ago
3 0
The percentage of atoms in the universe that are hydrogen are 90%
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Which of these elements has two valence electrons? A.hydrogen B.barium C.nitrogen D.krypton E.bromine
Umnica [9.8K]

Answer:

Barium

Explanation:

3 0
3 years ago
calculate the atomic number of an element whose neutral atom has four electrons in its valence shell and its valence shell is th
insens350 [35]

Answer:

The atomic number of the atom is 14.

Explanation:

The following data were obtained from the question:

Valence electrons = 4

Atomic number =.?

From the question given, we were told that the valence electron is in the m shell. Thus, we can say:

M shell = 4 electrons

The number of shells of the atom can be written in the order K, L, M with M as the last shell because we were told that the valence electrons i.e electrons in the outer shell is located at the M shell.

From a detailed knowledge of atom,

K shell = 1st shell

L shell = 2nd shell

M shell = 3rd shell

The first shell, K of an atom can only accommodate 2 electrons while others can accommodate a maximum of 8 electrons.

Note: we can only put electrons in another shell if a shell is already having 8 electrons. This rule only applies to the 2nd shell and above.

Thus, the atom in question has the following electrons:

K shell = 1st shell = 2 electrons

L shell = 2nd shell = 8 electrons

M shell = 3rd shell = 4 electrons

To get the atomic number of the atoms, we simply add all the electrons together.

This is illustrated below:

Atomic number = 2 + 8 + 4

Atomic number = 14

Therefore, the atomic number of the atom is 14.

6 0
3 years ago
Two reasons why a scientist might want to study the DNA of strawberries?
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1.To discover the chromosomal state of the species in order to advance on Knowledge of the species Evolutionary process.
2. To form a hybrid of the species.
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One of these element behaves partly as the alkaline metal as well as a halogen element
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The answer is Hydrogen
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strontium-90 has a half life of 29 years. if a site held 4000 kg of this isotope, approximately what mass of strontium-90 would
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Answer:

125g

Explanation:

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