Name two elements each one of which has filled outermost shell.
Name two elements each one of which has filled outermost shell.
Step-1: Introduction
The elements in periodic table are placed in periods and groups. Periods are horizontal rows that has increasing atomic numbers. Groups are vertical columns. There are 7 periods and 18 groups in periodic table. The outermost shell is the valence shell of the element. The elements in groups have similar electronic configuration of the valence shell.
Step-2: Group 18 elements
Number of valence electrons in the outermost shell = 0. This means that the electrons are completely filled.
The elements in a group that has completely filled outermost shell are group 18. The group 18 elements are called as noble gas. So, the elements belong to group 18.
The group 18 has six elements. This group elements are unreactive.
The two elements that has filled electrons in its outermost shell are Neon () and Argon ().
Neon has 2 electrons in K-shell and 8 electrons in L-shell with atomic number 10. Argon has 2 electrons in K-shell, 8 electrons in L-shell and 8 electrons in M-shell with atomic number 18.
Step-3: Final answer
Therefore, the two elements that has filled outermost shell are Neon and Argon.
Step-1: Introduction
The elements in periodic table are placed in periods and groups. Periods are horizontal rows that has increasing atomic numbers. Groups are vertical columns. There are 7 periods and 18 groups in periodic table. The outermost shell is the valence shell of the element. The elements in groups have similar electronic configuration of the valence shell.
Step-2: Group 18 elements
Number of valence electrons in the outermost shell = 0. This means that the electrons are completely filled.
The elements in a group that has completely filled outermost shell are group 18. The group 18 elements are called as noble gas. So, the elements belong to group 18.
The group 18 has six elements. This group elements are unreactive.
The two elements that has filled electrons in its outermost shell are Neon () and Argon ().
Neon has 2 electrons in K-shell and 8 electrons in L-shell with atomic number 10. Argon has 2 electrons in K-shell, 8 electrons in L-shell and 8 electrons in M-shell with atomic number 18.
Step-3: Final answer
Therefore, the two elements that has filled outermost shell are Neon and Argon.
