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3 years ago

How many core electrons does magnesium (Mg) have?

Chemistry

2 answers:

STatiana [176]3 years ago

6 0

Hence Mg has 10 core electrons and 2 valence electrons. The number of core electrons depends on the period (row) in which the element is found.

OLga [1]3 years ago

6 0

Answer:

Explanation:

Mg is element No. 12.

It has 12 electrons, with a shell configuration of 2, 8, 2.

The last two electrons are the valence electrons; the remaining 10 electrons are the inner or core electrons.

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What is the difference between alkali metals and halogens?

Airida [17]

<h3>→soft and reactive metals. </h3>

Explanation:

<h3>Alkali metals are soft and reactive metals. They react vigorously with water and become more reactive. And other hand halogens are reactive non metals. ... Halogens can be solid, liquid, gaseous at room temperature and the melting point increase when they get bigger.</h3>

<h2>#CAREYINGTOLEARN❤️</h2>

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2 years ago

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Two isotopes of hypothetical element X exist with abundances of 30.00% 100X and 70.00% 101X. What is the approximate atomic mass

Rasek [7]

Answer:

C. 100.7 amu

Explanation:

Isotopes of an element are atoms of an element with the same atomic number but different atomic masses. Each atomic mass of an isotope is known as an isotopic mass. An element that exhibits isotope, that is, that have two or more isotopes has a relative atomic mass that is not a whole number.

Relative atomic mass of X is the sum of the products of the relative abundances of each isotope and its isotopic mass.

For Isotope ¹⁰⁰X: 30% × 100 = 30 amu

For Isotope ¹⁰¹X: 70% × 101 = 70.7 amu

Relative atomic mass of X = (30 + 70.7) amu = 100.7 amu

Therefore, the approximate atomic mass of X is 100.7 amu

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2 years ago

What does the air in the troposphere do as it heats up from the sun?

Digiron [165]

It usually holds more water because of evaporation and makes the earth very hot.

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2 years ago

Which Of These Is An Indication That A Chemical Reaction Has Occurred?

nikdorinn [45]

<u><em>Answer:</em></u>

Correct option is D. Formation Of A Gas

<u><em>Explanation</em></u>

The main indication of chemical is that new substances are formed which have different composition than reactant.

<u><em>Freezing of a substance: </em></u>As in this case composition remained same, so we cant say, chemical reaction is take place, like when water freezes, it composition is same as water , so it is only its physical properties, not chemical.

<u><em>Melting of a substance:</em></u> As in this case composition remained same, so we cant say, chemical reaction is take place, like when ice melts, composition of water remained same , so it its physical properties, not chemical.

<u><em>Boiling of a substance:</em></u> As in this case composition remained same, so we cant say, chemical reaction is take place, like when water boils and become vapors, composition of water and vapors remained same , so it its physical properties, not chemical properties which show its chemical reaction.

<u><em>Formation of gas:</em></u>

In this case, chemical reaction take place. In chemical reactions, new substance are formed whose composition is different from reactants.

6 0

3 years ago

Read 2 more answers

Give the electron configuration for F.

postnew [5]

Answer:

1s² 2s² 2p⁵

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. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

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.

6. Its atomic number of 9.

7. its atomic mass is 18.99 amu.

Electronic configuration:

₉F = 1s² 2s² 2p⁵

4 0

3 years ago