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प्रश्न
The electron shell ______ is nearest to the nucleus.
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उत्तर
The electron shell K is nearest to the nucleus.
संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
Define:- Atom
Fill in the blank:
Atoms are _____
Define: Covalent bond
State two observations which show that atom is not indivisible.
What is an atom ? How do atoms usually exist ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Define – Atom.
An element is composed of ______ atoms.
In the nucleus of `""_20"Ca"^40`, there are ______
Atoms of different elements having the same number of ______ are called isotones.
The most abundant type of atom is the universe is ______.
What is the fundamental particle of an element?
