P1: Choose the correct answer 1- The "magic numbers"...

P1: Choose the correct answer 1- The "magic numbers" according to shell model are a. Numbers of electrons that confer atomic stability. b. Numbers of protons and/or neutrons that confer nuclear stability c. n/p ratios that confer nuclear stability. d. Atomic masses that confer nuclear stability. 2- The radius of bismuth-210, r. 1.2 X10^-15 m is a. $7.132 \times 10^{-15}$ cm b. $7.132 \times 10^{-13}$ cm c. $7.132 \times 10^{+13}$ m d. $7.132 \times 10^{+15}$ m 3. Given the following mass doublet values, compute the corresponding values for the atomic mass of $^{84}Sr$: (Use: $^{12}C$=12.000000 u, m($^1H$)=1.00782503 u) ($^{12}C_6H_{12}$) - m($^{84}Sr$) = 0.180583$\pm$0.000023 u a) 83.19332532 u. b) 83.91331736 u. c) 83.99331752 u. d) 83.63322752 u. 4- The atomic mass of proton with mass 1.00728 U equal to a. $1.6749 \times 10^{-27}$kg b. $1.6720 \times 10^{-27}$kg c. $9.1095 \times 10^{-31}$kg d. $7.132 \times 10^{+15}$ Kg 5-Nuclei of the same element that have same atomic numbers but different mass number are called: a. Ions b. Isotopes c. Isotones d. Isobars 6. Atoms with odd atomic number have ...... Nuclear spin: a. Integral b. Half-integral Zero c. Zero d. None of these

Transcript

00:01 Come here in this question we have multiple questions so the first question is the nucleus of an atom so nucleus of an atom is having the following except they are asking so exception we have to give for nucleus so for nucleus it is positively charged as it is correct it is very dense because mass is present in this compound and in the nucleus only it contains protons and neutrons acid is also correct contains almost all of the so d option is the wrong option so which is the exception case for nucleus and the second thing is the neutrons so here what makes an atom so why an atom is electrically neutral so this is electrically neutral so what is the reason for this one? positively charged and negatively charged particles are in the same number.

01:14 Same number.

01:15 So that is protons and neutrons are in the same number.

01:19 That is the correct answer here.

01:20 If you see here, the neutrons balance out the protons and electrons.

01:25 It is wrong.

01:26 The nuclear force contains in the atom, neutralize the atom.

01:33 So it is also wrong.

01:35 The number of protons is equal to number of electrons.

01:38 So option c is a correct answer for this one.

01:42 Now, the third question is here it is what does the number 91 represents in the zirconium 91? so in zirconium 91, 91 represents the mass of the nucleus.

02:01 So atomic number the number of protons mass number so option c is a correct answer so now this one is the mass number so for zycoleum the atomic number is 41 so mass number is 91 and the fourth question is here um this is four isotopes of the same element have different so isotopes are having isotopes are having the same atomic number chemical properties and mass so masses is given number of protons all items are so here it is isotopes of the same element are have different so which is the difference so masses is the difference so option b is the correct answer for fourth one and fifth one it is the question that is a question that is a all atoms of the same element have the same so all atoms of the same element have the same number of protons number of neutrons mass number protons and neutrons so same protons we can say so atoms of all elements can have the same number of proteins but not mass number so there isotopes are present so same number of protons is present in option so here if you see the option we have mass number of neutrons number of protons so option a is our correct answer for this one and we go to the sixth question which quantity of can vary from among neutral atoms of the same element so which quantity will change here mass number is changes and atomic number of protons number of electrons is given here so a mass number is the correct answer option a is the correct answer so it can be vary here for the same elements and seventh question which of the following equals one atomic mass units.

04:28 So one atomic mass units of the proton.

04:31 So mass of proton plus neutrons, mass of electrons, and 1 divided by 12 of mass of 1 carbon...

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