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Question
Name or state the following:
Elements having same mass number but different atomic number
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Solution
4018Ar and 4020Ca
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RELATED QUESTIONS
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.
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Actual atomic mass is greater than mass number.
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Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Define the term of atomic number.
What is atomic number?
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
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Explain the following terms.
- Proton
- Electron
- Neutron.
K and L shells can accommodate a maximum of 2 and 8 electrons respectively.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
