Advertisements
Advertisements
Question
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Options
10
12
14
18
Solution
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is 14.
Explanation:
Si has a 14th atomic number and an electrical configuration of 2, 8, and 4. The third shell of silicon is packed with 50% as many electrons as the second shell.
APPEARS IN
RELATED QUESTIONS
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
Which element has two shells, both of which are completely filled with electrons?
On the basis of electronic configuration, how will you identify the first element of a period?
Name the type of elements which have outermost shell complete.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Which of the following statements about the Modern periodic table is correct?
Distinguish between:
s-block - p-block
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
