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3 years ago

The correct electron configuration for magnesium is: 1s 22s 22p 63s 3 True False

Chemistry

1 answer:

Dmitry [639]3 years ago

7 0

Answer:

False

Explanation:

Magnesium is the element of second group and third period. The electronic configuration of magnesium is - 2, 8, 2 or $1s^22s^22p^63s^2$

There are 2 valence electrons of magnesium.

Only the valence electrons are shown by dots in the Lewis structure.

As, stated above, there are only two valence electrons of magnesium, so in the Lewis structure, two dots are made around the magnesium symbol.

Given that the electronic configuration is:- $1s^22s^22p^63s^3$ .

Orbital s cannot accommodate 3 electrons and also in magnesium it has $3s^2$ . Hence, the statement is false.

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Arrange each set in order of decreasing atomic size:

MatroZZZ [7]

Answer: The decreasing order of atomic size:

For a: Pb > Sn > Ge

For b: Sr > Sn > Te

For c: Na > F > Ne

For d: Mg > Na > Be

Explanation:

Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

As moving from top to bottom in a group, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases. Thus, increasing the atomic radii of the atom.

As moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

For the given options:

Option a: Ge, Pb, Sn

Germanium (Ge) is present in Group 14 and period 4 of the periodic table.

Lead (Pb) is present in Group 14 and period 6 of the periodic table.

Tin (Sn) is present in Group 14 and period 5 of the periodic table.

So, the decreasing order of atomic size is:

Pb > Sn > Ge

Option b: Sn, Te, Sr

Tin (Sn) is present in Group 14 and period 5 of the periodic table.

Tellurium (Te) is present in Group 16 and period 5 of the periodic table.

Strontium (Sr) is present in Group 2 and period 5 of the periodic table.

So, the decreasing order of atomic size is:

Sr > Sn > Te

Option c: F, Ne, Na

Fluorine (F) is present in Group 17 and period 2 of the periodic table.

Neon (Ne) is present in Group 18 and period 2 of the periodic table.

Sodium (Na) is present in Group 1 and period 3 of the periodic table.

So, the decreasing order of atomic size is:

Na > F > Ne

Option d: Be, Mg, Na

Beryllium (Be) is present in Group 2 and period 2 of the periodic table.

Magnesium (Mg) is present in Group 2 and period 3 of the periodic table.

Sodium (Na) is present in Group 1 and period 3 of the periodic table.

So, the decreasing order of atomic size is:

Mg > Na > Be

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4 years ago

a piece of debris travelling through space which ranges in size from a grain of sand to over 100ft in diameter

dezoksy [38]

Answer:

Meteoroids are tiny asteroids or the broken-off crumbs of comets and sometimes planets. They range in size from a grain of sand to boulders 3 feet (1 meter) wide. When meteoroids collide with a planet's atmosphere, they become meteors

pls give me brainliest lol :)

6 0

3 years ago

True or false: in the water cycle, water returns to Earth as condesation, usually in the form of rain or snow.

ch4aika [34]

False. Condensation forms the clouds, the way water returns to the earth is through precipitation. Hope this helps.

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3 years ago

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PLS HELP - How many moles are present in 3.01 x 1023 atoms of N2 (nitrogen gas) ?

Neporo4naja [7]

Answer: