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प्रश्न
Name two particles found inside the nucleus. What are they collectively called ?
उत्तर
Protons and Neutrons. Mass number.
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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?
Define:- Molecule
Write the names of `("NH"_4)_2"SO"_4` compounds:
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An ion with positive charge is called ______
Define: Covalent bond
Give two examples for each of ionic and covalent bond.
Name the particle or particles you would expect to find in :
The nucleus of an atom
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
What is an atom ? How do atoms usually exist ?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
______ is the smallest particle of an element.
1 mole of Gold and Silver contain same number of atoms.
Write any two observations which support the fact that atoms are divisible.
