All categories

3 years ago

Why do elements in the same period of the periodic table have different properties?

Chemistry

1 answer:

Alexxandr [17]3 years ago

5 0

Elements in the same period have different properties because the number of valence electrons in their outermost shells differ. ... In a given column or group, all elements have the samenumber of electrons in their outermost shells. For example, in group 2, allelements have two electrons in their outermost shell.Sep 29, 2020

You might be interested in

The total mass of the atmosphere is about 5.00 x 1018 kg. How many moles each of air, O2, and CO2 are present in the atmosphere?

n200080 [17]

Answer: The moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of atmosphere = $5.00\times 10^{18}kg=5.00\times 10^{21}g$

Average molar mass of atmosphere = 28.96 g/mol

Putting values in above equation, we get:

$\text{Moles of atmosphere}=\frac{5.00\times 10^{21}g}{28.96g/mol}=1.73\times 10^{20}mol$

We know that:

Percent of oxygen in air = 21 %

Percent of carbon dioxide in air = 0.0415 %

Moles of oxygen in air = $\frac{21}{100}\times 1.73\times 10^{20}=3.63\times 10^{19}mol$

Moles of carbon dioxide in air = $\frac{0.0415}{100}\times 1.73\times 10^{20}=7.18\times 10^{16}mol$

Hence, the moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

6 0

3 years ago

Balancing chemical equations (8 questions)

sweet [91]

Sorry it’s messy, hope this helps :]

4 0

2 years ago

When unbalanced forces act on an object that is in motion, the object can:

AlekseyPX

Answer:

A. change speed, direction, or both

Explanation:

hope this helps. . . <3

good luck! uwu

5 0

3 years ago

For real gases, how does a change in pressure affect the ratio of PV to nRT?

romanna [79]

A the ratio decreases as pressure increases

3 0

3 years ago

Read 2 more answers

Explain what is water of crystallization

ArbitrLikvidat [17]

Explanation:

In chemistry, water(s) of crystallization or water(s) of hydration are water molecules that are present inside [crystal]s. Water is often incorporated in the formation of crystals from aqueous solutions. ... Water of crystallization can generally be removed by heating a sample but the crystalline properties are often lost

3 0

3 years ago