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प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
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उत्तर
Y
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संबंधित प्रश्न
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 combine in definite proportions to form compounds.
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define: Ions
What are orbits or shells ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Fill in the blank
An _______ is electrically neutral.
Name the unit in which the radius of an atom is usually expressed.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
The smallest particle of matter that can exist by itself is ______.
The basic unit of matter is ______.
The smaller particles found in the atom is called ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the following term with an example.
Metal
The smallest unit of an element is ______.
The ______ are combination of atoms of various elements or the same element.
Atoms have a radius of the order ______.
