Question

Sort these elements into pairs that would most likely exhibit similar chemical properties. It doesn't matter which pair goes in which box, so long as the correct elements are paired.
P,As,Ar,He,Ba,Ca

Answer 1

The pairs of elements with similar chemical properties are as follows:

$\boxed{\begin{aligned} {\text{P and As}} \hfill \\ {\text{Ar and He}} \hfill \\ {\text{Ba and Ca}} \hfill \\ \end{aligned}}$  

Further Explanation:

The unique features of varioussubstances that make them different from the other substances are called properties.

Classification of properties:

Physical properties:

While measuring such properties, chemical composition of substances is kept unaltered. These are used for observation and explanation of matter. Density, color, texture, polarity and solubility are some of the examples of physical properties.

Chemical properties:

These are the characteristics of substances that can be observed during its chemical reaction. Such properties are not predicted by mere observation or by physical appearances Heat of combustion, enthalpy of combustion, toxicity, flammability are some examples of chemical properties.

The chemical properties of different elements are dependent on the number of valenceelectrons present in the element. Elements with same number of valence electrons show many similarities in their chemical properties.

Atomic number of P is 15 and it has an electronic configuration of  $1{s^2}2{s^2}2{p^6}3{s^2}3{p^3}$ . It has five valence electrons in it.

Atomic number of As is 33 and it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^{10}}4{s^2}4{p^3}$. It has five valence electrons in it.

Since P and As have five valence electrons in each, these belong to group 15of periodic table and have similar chemical properties.

Atomic number of Ar is 18 and it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}$. It has eight valence electrons in it. This implies its valence shell is completely filled and it belongs to noble gas family of periodic table.

Atomic number of He is 2 and it has an electronic configuration of  . It has two valence electrons in it.This implies its valence shell is completely filled and it belongs to noble gas family of periodic table.

Since Ar and He have fulfilled electronic configurations, these belong to group 8 of periodic table and have similar chemical properties.

Atomic number of Ba is 56 and it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^{10}}4{s^2}4{p^6}4{d^{10}}5{s^2}5{p^6}6{s^2}$. It has two valence electrons in it.

Atomic number of Ca is 20 and it has an electronic configuration of $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}$. It has two valence electrons in it.

Since Ba and Ca have two valence electrons in each, these belong to group 2 of periodic table and have similar chemical properties.

Learn more:

1. Which of these is an extensive property? brainly.com/question/1398514
2. Why density is an important property of metal? brainly.com/question/1593730

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Physical and chemical properties

Keywords: physical properties, chemical properties, P, As, He, Ar, 20. 33. 2, 18, 15, 33, Ba, Ca.

Answer 2

Explanation:

It is known that neutral elements with same number of valence electrons will have same chemical properties. Therefore, elements of same group show similar chemical properties.

Thus, we can see that P and As belongs to group 15. So, they will exhibit similar chemical properties.

Both Ca and Ba belongs to group 2, hence they will exhibit similar chemical properties.

Whereas both He and Ar belongs to group 18 and they will exhibit similar chemical properties.