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प्रश्न
Fill in the blank
A deficiency of electrons produces a ________ charge.
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उत्तर
A deficiency of electrons produces a positive charge.
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संबंधित प्रश्न
Write the names of the elements present in the:-
Sodium hydroxide
Fill in the blank
An ion with negative charge is called _______
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Name the three subatomic particles present in an atom.
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
What value has been given to the mass of this reference atom ?
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Electron, proton, neutron are the types of ______ in an atom.
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.
The smaller particles found in the atom is called ______.
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.
Which of the following statements made by Dalton has not undergone any change?
An element is composed of ______ atoms.
Write any two observations which support the fact that atoms are divisible.
______ is a substance that is made up of three oxygen atoms chemically combined.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
