Advertisements
Advertisements
Question
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Advertisements
Solution
(i) Mass no. = 31
(ii) Atomic no. = 15
(iii) Electronic configuration: (2, 8, 5)
That is,
\[\ce{\underset{2}{K} \underset{8}{L} \underset{5}{M}}\]
APPEARS IN
RELATED QUESTIONS
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
What is variable valency? Name two elements having variable valency and state their valencies.
Name the particles which actually determine the mass of an atom.
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
In a neutral atom number of protons is equal to the number of neutrons.
Compare the charge and mass of protons and electrons.
