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Galina-37 [17]
3 years ago
6

How does the periodic table used today classify elements?

Chemistry
2 answers:
Svetlanka [38]3 years ago
7 0
The periodic table of today organizes the elements as per their atomic numbers..and not atomic masses.
S_A_V [24]3 years ago
3 0

Answer:

The Periodic Table organizes chemical elements according to the number of protons that each has in its atomic nucleus

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Which electrons are the valence electrons in a neutral atom of fluorine (F)? Write the orbital configuration of just the valence
ICE Princess25 [194]

Answer:

2s² 2p⁵

There are seven valance electrons in fluorine.

Explanation:

The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other.

Properties of fluorine:

1. it is yellow in color.

2. it is flammable gas.

3. it is highly corrosive.

4. fluorine has pungent smell.

5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.  

Electronic configuration of fluorine:

F₉ = 1s² 2s² 2p⁵

Valance electrons in fluorine are 2s² 2p⁵.

Valance Orbital configuration:

2s² 2p⁵

There are seven valance electrons in fluorine.

4 0
3 years ago
How many moles of oxygen are in 1 mole of iron (II) nitrate?
Alekssandra [29.7K]

Answer:

Explanation:

One mole of Fe(NO3)3, or iron(III) nitrate, has three moles of nitrate molecules, which have three moles of oxygen atoms each. We can show this mathematically:

1 mole Fe(NO3)3 * (3 moles NO3)/(1 mole Fe(NO3)3) = 3 moles NO3

3 moles NO3 * (3 moles Oxygen)/(1 mole NO3) = 9 moles Oxygen

9 moles of Oxygen in one mole Fe(NO3)3

3 0
3 years ago
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There are two types of physical changes and chemical reactions- endothermic and exothermic. On the diagram below, which picture
Agata [3.3K]

Answer:

it is b because its releases heat in to all directions and not b because it staying inside and not releasing anything :)

Explanation:

6 0
4 years ago
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Which of the following is a mixture? <br> Gold <br> Honey <br> Steel <br> Water
Ronch [10]
Hi,

The option above that is correct to the question is 'Honey'.

Gold, steel, and water are all organic or natural resources. 


Faith xoxo
7 0
3 years ago
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Less dense then gas
Slav-nsk [51]
Nothing is less dense than gas. gas is the least dense form of matter.
4 0
4 years ago
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