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3 years ago

What relationship can be seen in an element's placement within a group and its electron configuration?

1 answer:

7 0

On the periodic table, a group of elements is a column of elements. These columns are also known as families, which indicates that the elements within a group will share certain characteristics. One of these characteristics is the number of valence electrons, or the electrons on the outermost orbit of an atom. So, any element within the same group will have the same number of valence electrons, which will then lead to other shared characteristics, such as chemical properties (how an atom reacts during a chemical reaction, for example).

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The number of _______________ in the nucleus determines an element's atomic number. this number defines the name of the element,

AleksandrR [38]

The number of protons in the nucleus determines an element's atomic number.

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3 years ago

7th grade help me plzzzz

Flauer [41]

Answer: I think it’s compounds only

Explanation:

6 0

3 years ago

A gaseous hydrogen and carbon containing compound is decomposed and formed to contain 82.66% carbon and 17.34% hydrogen by mass.

Romashka [77]

Explanation:

Mole percentage of carbon = $\frac{percentage given}{molar mass of carbon}$

= $\frac{82.66}{12}$

= 6.89

Mole percentage of hydrogen = $\frac{percentage given}{molar mass of hydrogen}$

= $\frac{17.34}{1}$

= 17.34

Now, dividing mole percentage of both the atoms by 6.89.

Then, C = 1 and H = $\frac{17.34}{6.89}$ = 2.5

Hence, empirical formula is $C_{2}H_{5}$ .

As, it is given that P = 556 mm Hg. Convert mm Hg into atm as follows.

$\frac{556 mm Hg \times atm}{760 mm Hg}$

= 0.7316 atm

Volume is given as 158 mL. So, in liter volume is $\frac{158}{1000}$ equals 0.158 L.

According to ideal gas equation, PV = nRT

$0.7316 atm \times 0.158 L = \frac{mass}{molar mass} \times 0.082 atm L/mol K \times 298 K$

$0.7316 atm \times 0.158 L = \frac{0.275 g}{molar mass} \times 0.082 atm L/mol K \times 298 K$

molar mass = 58.2 g

Hence, molecular weight of $C_{2}H_{5}$ is $12 \times 2 + 5$ = 29.

Therefore, $(C_{2}H_{5})_{n}$ = 58

29 × n = 58

n = 2

Thus, molecular formula of the compound is $C_{4}H_{10}$ .

8 0

4 years ago

Calculate the number of grams of solid aluminium chloride that will form when a mixture containing 0.150 g of aluminum powder an

Alinara [238K]

Answer:

the answer is B:) have a good day

5 0

3 years ago

A colloid can be detected by using the _________ effect. mohs tyndall faraday brownian

Sliva [168]

A colloid can be detected by using the Tyndall effect. The correct option among all the options that are given in the question is the second option. The other choices are incorrect and can be easily neglected. I hope that this is the answer that you were looking for and the answer has actually come to your desired help.

3 0

3 years ago

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