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Questions
Define the term of atomic number.
What is meant by the term atomic number
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
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
FILL IN THE BLANK
Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
From the symbol `""_12^24"Mg"`
, state the mass number, the atomic number and electronic configuration of magnesium.
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State Valency of each element
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
State the main postulates of Dalton’s atomic theory.
Name the 3 sub-atomic particles of an atom.
Electrons revolve around the nucleus in definite open shells.
In a neutral atom number of protons is equal to the number of neutrons.
