Advertisements
Advertisements
Question
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Advertisements
Solution
Electronic configuration of element with atomic number 12 is:
K2 L8 M2
There will be 2 electrons in the K shell, 8 electrons in the L shell and 2 electrons in the M shell of its atom.
APPEARS IN
RELATED QUESTIONS
Explain the Atomic number with example.
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 × 10-18C, calculate the number of electrons present on it.
Fill in the blank
An ion which has a positive charge is called a ..................
FILL IN THE BLANK
Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Define the term of atomic number.
The Atomic number of an element is 20. It has ______ valence electrons.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
