Advertisements
Advertisements
Question
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
Advertisements
Solution
| ATOMIC NO. | MASS NO. | PROTONS | NEUTRONS | ELECTRONS | SYMBOL |
| 10 | 22 | 10 | 12 | 10 | Ne |
APPEARS IN
RELATED QUESTIONS
What is variable valency? Name two elements having variable valency and state their valencies.
FILL IN THE BLANK
Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Calcium – \[\ce{^40_20Ca}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Silicon [At. no. = 14, Mass no. = 28]
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Mass No =______ + No. of Neutrons.
Match the following:
| Column A | Column B | ||
| 1. | K shell | a. | 8 |
| 2. | L shell | b. | 32 |
| 3. | M shell | c. | 2 |
| 4. | N shell | d. | 18 |
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
