Advertisements
Advertisements
Questions
Define the term of atomic number.
What is meant by the term atomic number
Advertisements
Solution
Atomic number [Z]: “Is the number of protons in the nucleus of an atom.”
OR “Is the number of positive charges in the nucleus of its atom.”
OR “Is the number of electrons in the complete atom.”
Z = P = e
RELATED QUESTIONS
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
ÅIn group I of the periodic table, three elements X, Y, and Z have ionic radii 1.33 Å, 0.95 Å and 0.60 Å respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
Mass No =______ + No. of Neutrons.
Mass No. 27 is for the element ______.
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
Ca2+ has completely filled outer shell. Justify your answer.
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.
