atomic number of an atom is the sum of all of its ne eeutrons b isotopes C proto

Question

atomic number of an atom is the sum of all of its ne eeutrons b isotopes C protons plus electrons d protons e. neutrons plus protons 17. Which of the following statements is fatse? a The proton and neutron are primarity responsible for the mass of an atom. d The charge on electrons and protons are equal in magnitude and opposign b The mass of a proton and a neutron are appraximately the same and opposite in sign mass of a proton is approximately one gram 18. Elements that lie next to each other in the same group of the Periodic T able have a similar chemical properties b. identical atomic numbers c. identical atomic weights d the same number of isotopes e the same number of neutrons in their nuclei 19. Match the fundamental charge and mass with the appropriate subatomic Charge--1, Mass 0 amu proton proton Charge +1 Mass-1 amuMass 1 amu Charge 0 neutron neutron proton electron proton neutron d. electron neutron 0 Which of the following symbol/name pairs is/are correctly matched? i. Mg. Manganese ii. Ca, Calcium iv. Ce, Chlo V. Na, Sodium ¡¡¡, and v iand v d. iii and v e vonly í, i, and v b. e a. 21. Be is the chemical symbol for d. beryllium e b. sodium c. sulfur a. silicon 22. Which of the following statements is/are true? i groups are arranged vertically in the periodic table ii. periods are arranged horizontally in the periodic table ii periods are numbered from top to bottom iv. there are eight elements in the second period a. ionlyb. i and i c. i, i and ii d. i, li, iv e. all are correct

Explanation / Answer

Ans 16 : d) protons

The atomic number is specific for each element. It is determined by the number of protons in the nucleus of the atom of that element.

The sum of protons and neutrons determine the mass number of the element , as electrons are considered to have negligible mass.

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