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प्रश्न
Define the following term with an example.
Compound
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उत्तर
Compound: A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions.
Ex: H20, NaCl.
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संबंधित प्रश्न
Define: Chemical bond
Define: Relative atomic mass
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Name two particles found inside the nucleus. What are they collectively called ?
Name the particles which revolve around the nucleus.
What are orbits or shells ?
Who originated the word ‘atom’ ?
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
How is the size of an atom indicated ?
Is it possible to see atoms these days ? Explain your answer.
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Name the gas that.
Turns moist starch iodide paper blue black.
Define the following term with an example.
Element
The basic unit of matter is ______.
Define the following term with an example.
Metalloid
Give the salient features of “Modern atomic theory”.
The smallest unit of an element is ______.
What is the fundamental particle of an element?
