Question

decide the position of an element having atomic number 19
​

Answer 1

Answer:

First take the Atomic number of the given element. ...

Then calculate the electronic configuration using the atomic number 2+8+7=17 therefore the electronic configuration will be 2, 8, 7.

Here we find that the no of valence electrons of element is 7 as the valence shell has 7 electrons.

PLZ MARK BRAINLIEST IF THIS IS USEFUL

Answer 2

$\huge {\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

We already know that all the elements in periodic table are arranged serially according to their atomic numbers. There are 18 groups and 7 periods. The elements are arranged in such a way that the elements get categorized according to their properties.

We have to keep certain things in mind (Not applicable for transition groups and its elements)

1. The period of element relates the number of shells of an atom of the given element.

2. The group is similar to the no of valence electrons of given element.

3. The valency is the no of electrons it accepts or donates. So in case of non-metals valency = 8-valence electrons & in case of metals valency=valence electrons... This is because non-metals accept so lacked electrons only considered.

4. The number of element in each period is calculated by 2n^2.

Steps to find the position of an non-transitional element in periodic table

1. First take the Atomic number of the given element. Say Cl... Atomic no. 17

2. Then calculate the electronic configuration using the atomic number 2+8+7=17 therefore the electronic configuration will be 2, 8, 7.

3. Here we find that the no of valence electrons of element is 7 as the valence shell has 7 electrons.

4. So know we easily understand that the group is 7 because the no of valence electrons is 7.

5. Now to find the period we have to understand that the period is the number of shell the element is having therefore here chlorine has 3 shells (K-2, L-8, and M-7). So the period of the given element is 3.

•♫•♬• I hope u like it (◍•ᴗ•◍)❤ •♫•♬•

ლ(╹◡╹ლ)Kindly mark me as Brainliest