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Zanzabum
3 years ago
10

How many elements are on the Periodic Table?

Chemistry
2 answers:
Margarita [4]3 years ago
8 0
118 elements (^.^)/)
Slav-nsk [51]3 years ago
7 0
There are a total of 118 elements on the periodic table. 
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yanalaym [24]
Warm air is transferred from the surface to high elevations near the eye, further accelerating winds and circulation. Composed of rows of cumulonimbus clouds--big thunderstorm. They are usually the first part of the cyclone to arrive on land. Yw
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2 years ago
7. How many formula units are equal to a 0.25 g sample of Chromium (III) sulfate,
ryzh [129]

Answer:

38.541 × 10¹⁹ formula units

Explanation:

Given data:

Mass of chromium sulfate = 0.25 g

Formula units in 0.25 g = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ formula units of water

Number of moles of chromium sulfate =  Mass / molar mass

Number of moles of chromium sulfate = 0.25 g/ 392.16 g/ mol

Number of moles of chromium sulfate = 6.4 × 10⁻⁴ moles

Number of formula units:

1 mole = 6.022 × 10²³ formula units

6.4 × 10⁻⁴ moles × 6.022 × 10²³ formula units / 1 mol

38.541 × 10¹⁹ formula units

7 0
3 years ago
How many electrons can occupy the 4p sublevel of a neutral atom of bromine
VMariaS [17]

Answer:

6

Explanation

every p sublevel holds up to 6 electrons

so the 4p sublevel  must hold up to 6 electonsr

4 0
2 years ago
Which term represents the fixed proportion of elements in a compound
Gekata [30.6K]

Answer:

Chemical formula.

Explanation:

A chemical formula have fix proportion of atoms of elements.

Chemical formula:

A chemical formula is the way of presenting the chemical proportion of atoms of those elements, that combine to form a compound.

For example:

Water consist of two atom of hydrogen and one atom of oxygen. The atoms of both elements combine to form a compound i.e water. The atoms of both elements always combine in a fixed ratio which is 2:1 in molecule of water.

H₂O

2:1

Carbon dioxide consist of two atom of oxygen and one atom of carbon. The atoms of both elements combine to form a compound i.e carbon dioxide. The atoms of both elements always combine in a fixed ratio which is 1:2 in molecule of carbon dioxide .

CO₂

1;2

5 0
3 years ago
In the compound AbO3, the ratio of aluminum to<br> oxygen is
jasenka [17]
The compound is Al2O3. The ratio of aluminum to oxygen is 2:3.
3 0
3 years ago
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