Answer true or false. (a) A proton and an electron have the same mass but opposite charges. (b) The mass of an electron is cosiderably smaller than that of a neutron. (c) An atomic mass unit (amu) is a unit of mass. (d) One amu is equal to 1 gram. (e) The protons and neutrons of an atom are found in the nucleus. (I) The ekectrons of an atom are found in the space surrounding the nucleus. (g) All atoms of the same element have the same number of protons. (h) All atoms of the same element have the same number of electrons. (i) Electrons and protons repel each other. (j) The size of an atom is approximately the size of its nucleus. (k) The mass number of an atom is the sum of the numbers of protons and neutrons in the nucleus of that atom. (l) For most atoms, their mass number is the same as their atomic number. (m) The three isotopes of hydrogen (hydrogen-i, hydrogen-2, and hydrogen-3) differ only in the number of neutrons in the nucleus. (n) Hydrogen-i has one neutron in its nucleus, hydrogen-2 has two neutrons in its nucleus, and hydrogen-3 has three neutrons. (o) All isotopes of an element have the same number of electrons. (p) Most elements found on Earth are mixtures of isotopes. (q) The atomic weight of an element given in the Periodic Table is the weighted average of the masses of its isotopes found on Earth. (r) The atomic weights of most elements are whole numbers. (s) Most of the mass of an atom is found in its nucleus. (t) The density of a nucleus is its mass number expressed in grams.
Electron Affinity
When an element undergoes a chemical reaction, it either gains energy or loses energy. This gain or loss of energy is due to the phenomena that occur at atomic level. During reaction, atoms either gain electrons from other atoms or lose electrons to other atoms, and in that process, energy is produced.
P-Block Elements
Elements which are present on the right side of the periodic table are called p-block elements. In addition to the noble gases, they include the families of boron, mercury, nitrogen, oxygen and fluorine. These elements have diverse real-life implementations that we regularly experience around us.
Metals and Non-metals
The periodic table is composed of metals, semi-metals and nonmetal elements. The physical and chemical properties of metals and nonmetals differ from each other. The study of metals and nonmetals will help one to understand the appropriate application of the particular element.
Answer true or false.
(a) A proton and an electron have the same mass but opposite charges.
(b) The mass of an electron is cosiderably smaller than that of a neutron.
(c) An
(d) One amu is equal to 1 gram.
(e) The protons and neutrons of an atom are found in the nucleus.
(I) The ekectrons of an atom are found in the space surrounding the nucleus.
(g) All atoms of the same element have the same number of protons.
(h) All atoms of the same element have the same number of electrons.
(i) Electrons and protons repel each other.
(j) The size of an atom is approximately the size of its nucleus.
(k) The mass number of an atom is the sum of the numbers of protons and neutrons in the nucleus of that atom.
(l) For most atoms, their mass number is the same as their
(m) The three isotopes of hydrogen (hydrogen-i, hydrogen-2, and hydrogen-3) differ only in the number of neutrons in the nucleus.
(n) Hydrogen-i has one neutron in its nucleus, hydrogen-2 has two neutrons in its nucleus, and hydrogen-3 has three neutrons.
(o) All
(p) Most elements found on Earth are mixtures of isotopes.
(q) The atomic weight of an element given in the Periodic Table is the weighted average of the masses of its isotopes found on Earth.
(r) The atomic weights of most elements are whole numbers.
(s) Most of the mass of an atom is found in its nucleus.
(t) The density of a nucleus is its mass number expressed in grams.
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