Same: 20. What does the numbor 84 in the name krypton-84 the sum of the protons

Question

Same: 20. What does the numbor 84 in the name krypton-84 the sum of the protons and electrons b. a. twice the number of protons e the mass numer d the atomic number Using the periodic table, determinc the number of neutrons in oxygen 1 a. 10 b. 8 c. 16 d. 24 22. The charge on a gamma ray is b. +1 d. 0 When radium-226 (atomic number 88) decays by cmitting an alpha particle, it becomes a. radon-222 23, c. radium-222 d. polonium-222 b. polonium-224 Which of the following is true about subatomic particles? a. Neutrons have no charge and are the lightest subatomic particle b. The mass of a neutron nearly equals the mass of a proton c. Protons are positively charged and the lightest subatomic particle d. Electrons are negatively charged and are the heaviest subatomic particle 24. The atomic number of an clement is the total number of which particles in the nucleus? a protons b. ncutrons 25 c, electrons d. protons and electrons 26. A reaction in which small nuclei combine to form a heavier nucleus is called c fission d. a chemical reaction fussonond radiation b. background radiation What is in the nucleus of an atom of iodine 131? a. 53 protons, 78 neutrons b. 78 protons, 53 neutrons 27. c 131 protons d. 53 protons, 53 electrons 28. IfE is the symbol for an element, which two of the following symbols represent isotopes of the same clement? a. b. 3 and 4 1 and 4 c. d. 2 and 3 1 and 2 29. An ion is created from a ncutral atom by a. b. gaining or losing gamma particles gaining or losing ncutrons c gaining or losing protons d. gaining or losing electrons 30. What is the least amount of protection nccessary to stop an alpha particle? a. three inches of lcad b. three fect of concretc c. single sheet of paper d. single shect of aluminum foil

Explanation / Answer

Ans 20- Here 84 are nucleons This is also known known as mass numbers which is equal to number of proton + neutron.

(c) is correct The mass number

Ans 2 - Mass number of oxygen =18

mass no = no. of proton + no of netron

no of proton in oxygen is 8

no of neutron = 18-8

no. of neutron = 10

Ans 22- Charge in gamma ray is 0 and mass is also 0

(d) 0

Ans 23- In alpha decay H42 is is emitted

Radium can be written as Ra 22688

so mass of new particle = 226-4 =222

atomic no. = 88-2 = 86

the particle with mass 222 and 86 atomic no. is Radon (Rn).

Ans = (a) Radon 222

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