An element X belongs to period 3 and group 17 of the periodic table. Name its valence shell and write the number of electrons in its valence shell.
An element X belongs to period 3 and group 17 of the periodic table. Name its valence shell and write the number of electrons in its valence shell.
A systematic arrangement of elements into groups and periods on the basis of similarities in chemical properties and in the order of their increasing atomic number is called modern periodic table.
The horizontal rows of the long form of the modern periodic table are called periods. There are 7 periods in periodic table.
The vertical columns of the long form of the modern periodic table are called groups. There are 18 groups in periodic table.
The valence shell is the outermost shell of an atom. The electrons in valence shell are called valence electrons.
The number of valence shell = number of period.
So, the valence shell is 3. The shell notation is M-shell.
The quantum number describe the movement of an electron in an atom.
Quantum numbers 1 2 3 Shell notation K L M Electrons 2 8 7
Therefore, the element belonging to period 3 and group 17 is Chlorine (). The valence shell is M-shell. The number of electrons in its valence shell is 7.
A systematic arrangement of elements into groups and periods on the basis of similarities in chemical properties and in the order of their increasing atomic number is called modern periodic table.
The horizontal rows of the long form of the modern periodic table are called periods. There are 7 periods in periodic table.
The vertical columns of the long form of the modern periodic table are called groups. There are 18 groups in periodic table.
The valence shell is the outermost shell of an atom. The electrons in valence shell are called valence electrons.
The number of valence shell = number of period.
So, the valence shell is 3. The shell notation is M-shell.
The quantum number describe the movement of an electron in an atom.
| Quantum numbers | 1 | 2 | 3 |
| Shell notation | K | L | M |
| Electrons | 2 | 8 | 7 |
Therefore, the element belonging to period 3 and group 17 is Chlorine (). The valence shell is M-shell. The number of electrons in its valence shell is 7.
