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marusya05 [52]
3 years ago
7

The elements listed in the periodic table account

Chemistry
1 answer:
ddd [48]3 years ago
3 0

Answer:

Only 4 %

Explanation:

Just about 4 percent of the known universe overall mass consists of atomic nuclei and is therefore described by chemical components. This proportion is around 15 percent of the total mass, with dark energy becoming the majority of the material .

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Which family in the periodic table has metals that are usually harder than other metals? Alkali metals Alkaline earth metals Lan
stealth61 [152]

Answer:

The correct answer is "Alkaline earth metals".

Explanation:

Alkaline earth metals are a group of elements that are located in group 2 of the periodic table. They are harder than alkaline metals, have brightness and are good electrical conductors. Hardness is the degree of scratch resistance a material offers.

Have a nice day!

3 0
3 years ago
How many moles of N are present in 1.36<br> mol of Benadryl?
marta [7]

Answer:

there are 35.7 mol H in 1.70 mol benadryl

Explanation:

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5 0
3 years ago
If all the water in 430.0 mL of a 0.45 M NaCI solution evaporates what is the mass of NaCI will remain
skad [1K]

Answer:

11.31 g.

Explanation:

Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.

M = (no. of moles of solute)/(V of the solution (L)).

<em>∴ M = (mass/molar mass)of NaCl/(V of the solution (L)).</em>

<em></em>

<em>∴ mass of NaCl remained after evaporation of water = (M)(V of the solution (L))(molar mass)</em> = (0.45 M)(0.43 L)(58.44 g/mol) = <em>11.31 g.</em>

6 0
3 years ago
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What atomic or hybrid orbitals make up the sigma bond between ge and h in germanium hydride, geh4 ?
ozzi
<span>Germane is the chemical compound with the formula GeH₄, and the germanium analogue of methane. It is the simplest germanium hydride and one of the most useful compounds of germanium.


</span>In chemistry, sigma bonds (σ bonds) are the strongest type of covalent chemical bond. They are formed by head-on overlapping between atomic orbitals. Sigma<span> bonding is most simply defined for diatomic molecules using the language and tools of symmetry groups.
</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
8 0
4 years ago
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PLEASE HELP!!!! <br> show work and also balance equation plus stoic
siniylev [52]

Answer:

:)

Explanation:

3 0
3 years ago
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