All categories

2 years ago

2. Periodic Table Layout. The periodic table is organized in horizontal rows and also in vertical

Chemistry

1 answer:

Marta_Voda [28]2 years ago

7 0

Answer:

Explanation:

Columns and rows used in the periodic classification of elements shows trends in the properties of elements.

The periodic columns are called groups and they denote vertical arrangement of elements.

The horizontal rows are the periods.

Groups and Periods provides a very simple way to classify elements.
They reflect trends among different elements that are found in nature. Following these groups and periods, it is even possible to predict the nature of an undiscovered element.
Certain parts of the table have some unique elements on them with some distinctive properties that distinguish them from others.
The atomic number is the basis of this classification. By this, it is possible to delineate that elements with similar properties are located on the same group.

You might be interested in

In how many grams of water should 25.31 g of potassium nitrate (kno3) be dissolved to prepare a 0.1982 m solution?

Artyom0805 [142]

Solution:

Molality:-It is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent

Therefore,

Molality = moles solute / kg solvent

Therefore kg solvent = moles solute / molality

moles solute = mass / molar mass

= 25.31 g / 101.1 g/mole

= 0.2503 mole

kg solvent = 0.2503 mole / 0.1982 m

= 1.263 kg

= 1263 g

This is the required answer.

6 0

3 years ago

Read 2 more answers

Determine the amount of water that must be added to a 2-litre solution of sulphuric acid to dilute it from a pH of 2.7 to a pH o

Ksivusya [100]

Answer:

Volume of water added = 2.0 L

Explanation:

Initial pH of the solution = 2.7

[H^+] concentration in 2 L solution of sulfuric acid,

$pH = -log[H^+]$

$[H^+] = 10^{-pH}\ M$

$[H^+] = 10^{-2.7} = 0.001995\ M = 0.002\ M$

Final pH of the solution = 3

Final [H^+] concentration of sulfuric acid,

$[H^+] = 10^{-pH}\ M$

$[H^+] = 10^{-3} = 0.001\ M$

Now,

$M_1V_1=M_2V_2$

$0.002 \times 2.0 = 0.001 \times V_2$

$V_2 = \frac{0.002 \times 2.0}{0.001} = 4.00\ L$

Volume added = Final volume - Initial volume

= 4.0 - 2.0 = 2.0 L

4 0

3 years ago

A scientist performs an experiment in which a radium–226 (Ra–226) atom decays into radon–222 (Rn–222). The scientist concludes t

tangare [24]

Answer:

Explanation:

5 0

3 years ago

Read 2 more answers

Molecules in the gas phase move faster than the same molecules love in the liquid true or false

vredina [299]

true gas molicules bounce off one another much faster liquid just slides

5 0

3 years ago

Read 2 more answers

What happens to the atomic mass of an element moving from left to right within a period

JulsSmile [24]

Answer:

As you move across a period, the atomic mass increases because the atomic number also increases. ... The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.

Explanation:

4 0

3 years ago