an atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valence…

an atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. which element is element x?\n sodium (na)\n boron (b)\n magnesium (mg)\n lithium (li)

an atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. which element is element x?\n sodium (na)\n boron (b)\n magnesium (mg)\n lithium (li)

Answer

Explanation:

Step1: Determine beryllium's electron - shell and valence - electron number

Beryllium (Be) has an atomic number of 4. Its electron configuration is 1s²2s². It has 2 electron - shells and 2 valence electrons.

Step2: Determine element X's electron - shell and valence - electron number

Element X has one more shell of electrons than beryllium, so it has 3 electron - shells. It has one less valence electron than beryllium, so it has 1 valence electron.

Step3: Identify the element

The element with 3 electron - shells and 1 valence electron is sodium (Na). Its electron configuration is 1s²2s²2p⁶3s¹.

Answer:

sodium (Na)