Question

An atom has 2 electrons in its outermost shell M. What is the atomic number of the element ? Also mention it's name

Answer 1

In the electronic arrangement in an atom of an element, the first shell always contain 2 electrons. The second shell always contain 8 electrons. In the element M, it is said that it has 2 electrons in the outermost shell. Thus the electronic configuration will be [2,8,2]. In total the element has 12 electrons, and that element's name is Magnesium

Answer 2

$<center><h2><p style="color:green;" >Solution :</p></h2></center> <center><h4><p style="color:red;" >➲ Since there are 2 electrons in M shell, the K shell and L shell must be completely filled with electrons. </p><p></p><p>➲ The maximum number of electrons K shell can hold is 2 that ofL shell is 8 and we know that M shell has 2 electrons. </p><p></p><p>➲ So, the total number of electrons are 2 +8 + 2 = 12. </p><p></p><p>➲ Now, we know that the total number of electrons in a neutral atom is equal to the number of protons, </p><p></p><p>➲ So, the atomic number of this element is 12.</p></h4><p style="font-size:100px">&#9760<p style="font-size:50px">#&#8492&#120007&#119990&#119998&#120003&#120001&#120014&#8475&#119990&#119990&#120015<p style="font-size:40px">&#128526</p>$