Consider a brass alley which copper and 341 line. How many g of zink are present

Question

Consider a brass alley which copper and 341 line. How many g of zink are present in a 125 kg sample of the alley? 2.4 g 42 g 83 g 2.4 times 10^4 g 4.2 times 10^4 g which of the following atoms contain 24 neutrons? Cr Hg Cd Cr Ca How many neutrons are in Sa? 34 45 79 113 117 Copper has two stable Isotopes, ^63Cu and^65Cu. How man protons, electrons, and neutrons does an atom of^65Cu contain? What is the Mass number of an atom of iodine with 74 neutrons? 76 53 106 129 250 A transition metal, a halogen, and a metalloid in that order are Ni, N, Sn Se, Si, Sb Cr, Cl, As As, Cl, Se Ca, Cl, Se Three elements in the lanthanide series are Ce, U, Rn Ce, Nd, Sn Ce, Te, Kb Cs, Ba, Ce Fr, Ra, Ce

Explanation / Answer

15) The percentage of Zinc in alloy = 34%

The mass of alloy = 125 Kg

So zinc mass = 34 % X 125 Kg = 42.5 Kg = 4.2 X 10^4 grams

16) The number of neutrons = Mass number - Atomic number

Chroium with atomic number = 24 and mass number = 48 so number of neutrons= 24

17) atomic number of Selenium = 34

mass number = 79

number of neutrons = mass number - selenium = 79- 34 = 45

18) The number of protons = atomic number= 29 ( in both the isotopes)

Number of electrons = atomic number = 29 (in both the isotopes)

Neutrons in Cu-63 = 63 - atomic number = 63 - 29 = 34

Neurtrons in Cu-65 = 65 - atomic number = 65 - 29 = 36

Answer : c

19)

the atomic number of iodine= 53

Number of neutrons = 76

so Mass number = number of neutrons + number of protons = 53 + 76 = 129

20) Halogen in all examples is : Chlorine (Cl)

Transition metal : Ni , Sc , Cr

Metalloid : Arsenic

So answer : Cr, Cl , As

21) the lanthanide seires elements are

Ce , Nd , Sm

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