Q.1. justify the given statements a) Electrons, protons and neutrons are fundamental particle of an atom. b) Hydrogen has three isotopes. All of these having same chemical properties. c) The charge on Mg in magnesium chloride is +2. d) He and Ne doesn't form and ions.
Answers
Answer:
An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.
Each electron has a negative charge (-1) equal to the positive charge of a proton (+1).
Neutrons are uncharged particles found within the nucleus.
Key Terms
atom: The smallest possible amount of matter which still retains its identity as a chemical element, consisting of a nucleus surrounded by electrons.
proton: Positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element. It weighs 1 amu.
neutron: A subatomic particle forming part of the nucleus of an atom. It has no charge. It is equal in mass to a proton or it weighs 1 amu.
Answer:
a. because they electrons, neutron, proton can be divided into smaller and smaller particles
b. because they have only one electron in their shells
c. because, magnesium has valency of 2 so, they form 2+
d. He and Ne has the 8 electrons in their outermost shell and has 0 valency so, they does not form ions