Mendeleev created the first periodic table by arranging the elements in the order of ?

Which statement is true about the ionic size of the elements in a group as one moves from top to bottom in that group?

nekit [7.7K]

Answer:

Ionic size increases from top to bottom within the group.

Explanation:

Ions are formed when neutral atoms of elements gain or lose electron(s).
The ionic radius is the distance from the nucleus of an ion to the outermost energy level.
The ionic size or radius increases down the group as the number of energy level increases.
Therefore, an ion of an element lower in the group will be larger than the ion of an element higher in the group.
For example, an ion of potassium, K+, is larger in size compared to the ion of sodium, Na+ since K+ has more energy levels than Na+.

8 0

3 years ago

Read 2 more answers

Use the periodic table to choose the element that matches each description.

nika2105 [10]

Using the periodic table to choose the element that matches each description include the following below:

Halogen: iodine

Group IIA: magnesium

Nonreactive: argon

Alkali metal: potassium.

<h3>What is a Periodic table?</h3>

This contains elements which are arranged according to the order of their atomic number in a tabular form. There are 18 groups which are the vertical columns present while there are 8 periods which are the horizontal rows present in the periodic table.

Example of an alkali metal is potassium while the non reactive ones include argon, neon etc. Examples of halogens include chlorine, iodine etc. are the ones which have seven electrons in their outer electron shells thereby just requiring one electron to achieve to obtain a stable octet configuration.

These are therefore the elements which match the descriptions provided in this case and is the most appropriate choice.

Read more about Periodic table here brainly.com/question/15987580

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8 0

1 year ago

How many grams of lithium chloride can be produced from 14.3 g of lithium chlorate when it decomposes into lithium chloride and

vampirchik [111]

6.7 grams of lithium chloride will be produced.

<h3><u>Explanation:</u></h3>

Lithium chlorate is LiClO₃ and lithium chloride is LiCl. The reaction is,

2LiClO₃ = 2LiCl +3O₂.

So here, 2 moles of lithium chlorate produces 2 moles of lithium chloride.

Or, one molecule of lithium chlorate will produce one mole of lithium chloride.

Molecular weight of lithium chlorate = $6.9 + 35.5 + 16\times3$ = 90.4.

So, 14.3 grams of lithium chlorate has 0.16 moles of lithium chlorate.

Thereby, moles of lithium chloride produced is 0.16 moles.

Molecular weight of lithium chloride = $6.9+35.5$ = 42.4 grams.

So weight of lithium chloride produced = $42.4 \times 0.16$ = 6.7 grams.

Thus, weight of lithium chloride produced will be 6.7 grams.

3 0

3 years ago

A moist red litmus paper is used for testing ammonia gas ,why

yawa3891 [41]

Answer:

when the red litmus paper is placed in a jar of ammonia, the red litmus paper turns into blue as ammonia gas is basic in nature. It confirms the alkalinity of the ammonia gas.

6 0

3 years ago

Which element is found in all the acids described in this section?

mixer [17]

Acids contain hydrogen!

8 0

3 years ago