Nucleons are sub-atomic particles (Protons and Neutrons) which are located in the nucleus of atoms.What are nucleons? Why are they so called? Write the properties of the nucleons? Calculate the number of electrons, protons and neutrons in its atom. The atomic number and the mass number of an element is 26 and 56 respectively. Electrons circle around the nucleus of an atom, they are negatively charged.The protons have a positive charge while neutrons have a neutral charge.The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).The nucleus of the atom contains the protons (positively charged) and the neutrons (no change).What will be its mass number?ĭraw the atom structure and explain the position of the sub-atomic particles. Find the element from the periodic table. The atomic number of an element is 9, it has 10 neutrons. The number of protons and neutrons present is its nucleus is called mass number of that atom.Įxample : Helium (He) has 2 protons and two electrons hence its atomic number will be 2.Įxample : Sodium (Na) has 11 protons and 12 Neutrons hence its mass number A= 11 + 12 = 23 The number of electrons or protons in an atom is called atomic number of that atom. Isotones are the atoms of different elements with same number of neutrons.ĭifferentiate mass number from atomic number. ![]() Thus isobars are different elementsĮxample : Hydrogen has three isotopes protium, with deuterium, tritium atomic number 1 but mass number 1,2,3.Įxample : Calcium and Argon are isobars as they have atomic number 20 and 18 but their mass number is 40. Isobars are such atoms which have same mass number but different atomic numbers. Isotopes are atoms of the same element thus having same atomic number but different mass number. Neutrons are the particles in an atom that have a neutral change (no charge). Its positive Charge is of the same magnitude as that of the electron’s negative charge. The proton is the positively charged particle and its located in the nucleus. The number of electrons or protons in an atom is called the atomic number of that atom. Reason : The mass number is sum of protons and neutrons.Īssertion is false but the reason is true statement.Ĭorrect statement: The number of protons and neutrons is mass number.Īn atom is the smallest particle of a chemical element that retains its chemical properties. Reason : Atoms have equal number of protons and electrons.īoth Assertion and Reason are true and Reason is the correct explanation of Assertion.Īssertion : The mass of an atom is the mass of nucleus.Ītomic Structure Notes For Class 7 Question 3.Īssertion : The number of protons and neutrons is atomic number. Samacheer Kalvi.Guru 7th Science Question 1.Īssertion : An atom is electrically neutral. Atomic number: _, Mass number: number of protons and neutrons.(False) Correct statement: The nucleus is surrounded by electrons. Correct statement: The electrons are negatively charged.Ĭlass 7 Science Chapter 4 Notes Question 3.Ītomic Structure Book Back Answers Question 4. Samacheer Kalvi Guru 7th Science Question 2.įalse. (False) Correct statement: The basic unit of an element is atom. ![]() The basic unit of an element is molecule. If False, give the correct statement (T/F).
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