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3 years ago

Which element has the same number of energy levels as oxygen?

Chemistry

2 answers:

Zina [86]3 years ago

7 0

Answer:

Elements have the same number of energy levels as oxygen.

Elements and definitions

Lithium - Lithium compounds, also known as lithium salts, are primarily used as a psychiatric medication. It is primarily used to treat bipolar disorder and treat a major depressive disorder that does not improve following the use of antidepressants.

Beryllium - Beryllium is a chemical element with the symbol Be and atomic number 4. It is a relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Within the cores of stars, beryllium is depleted as it is fused into heavier elements.

Boron - Boron is a chemical element with the symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust.

Carbon - Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalent-making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.

Nitrogen - Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table. It is a colorless, odorless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter.

Fluorine - Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon, neon, and helium.

Neon - Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble gas. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.

kari74 [83]3 years ago

3 0

Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon

All on energy level 2

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In a closed system containing three different gases as shown, X2 + Y2 = 2XY

Luden [163]

X2+Y2-2XY=(X-Y)2=0
X=Y

5 0

3 years ago

How many ions of aluminum oxide (Al²O³) are there in 200 g of Al²O³??

valentinak56 [21]

= 6.022 × 1020

Explanation;

Mole of aluminium oxide (Al2O3) is

⇒ 2 x 27 + 3 x 16

Mole of aluminium oxide = 102 g

i.e., 102 g of Al2O3= 6.022 x 1023 molecules of Al2O3

Then, 0.051 g of Al2O3 contains = 6.022 x 1023 / (102 x 0.051 molecules)

= 3.011 x 1020 molecules of Al2O3

The number of aluminium ions (Al3+) present in one molecule of aluminium oxide is 2.

Therefore, the number of aluminium ions (Al3+) present in 3.11 × 1020 molecules (0.051g) of aluminium oxide (Al2O3)

= 2 × 3.011 × 1020

= 6.022 × 1020

hope it helps_

6 0

2 years ago

Using the following thermochemical equation, determine the amount of heat produced from the combustion of 24.3 g benzene (C6H6).

Anna007 [38]

Answer:

ΔH = -976.5 kJ

Explanation:

For the reaction given, there are 2 moles of benzene (C6H6). The heat of this reaction is -6278 kJ, which means that the combustion of 2 moles of benzene will lose 6278 kJ of heat. It is an exothermic reaction.

The value of ΔH, the enthalpy, is a way of measurement of the heat, and it depends on the quantity of the matter (number of moles).

So, 24.3 g of benzene has :

n = mass/ molar mass

n = 24.3/78.11

n = 0.311 moles

2 moles ------------ -6278 kJ

0.311 moles ----------- x

By a simple direct three rule:

2x = -1953.08

x = -976.5 kJ

3 0

3 years ago

What is the proper way to write sodium in crystal form

Marysya12 [62]

Answer:

In the solid state Sodium has a body-centered cubic crystal structure with a = 0.428 nm and a nearest neighbor distance of 0.371 nm.

(I don't really know but I hope if this answer is correct for you).

5 0

3 years ago

A group of scientists wanted to test the effects of increased greenhouse gas concentrations on plant growth. They hypothesized t

yanalaym [24]

Answer:

CH₄ and N₂O are not likely to be biologically important greenhouse gases for tree growth

Explanation:

From the discussion of the experiment testing the given hypothesis in the question, all the gases tested, CO2, N2O and CH4 are all green house gases. The aim of the experiment was to ascertain the impact of the selected greenhouse gases on plant biomass. It was observed that CO2 does lead to increase in plant biomass while N2O and CH4 did not.

A proper deduction from the experiment will be 'CH₄ and N₂O are not likely to be biologically important greenhouse gases for tree growth'.

5 0

3 years ago