1) All atoms consist of a central nucleus surrounded by one or more orbital elec
ID: 700354 • Letter: 1
Question
1) All atoms consist of a central nucleus surrounded by one or more orbital electrons. The nucleus always contains proton and all nuclei heavier than hydrogen contain neutrons too. The protons and neutrons together make up most of the mass of the atom. So we found that correct statement from question is
D) Protons and neutrons have most of the mass but occupy very little of the volume of the atom
2) Dalton atomic theory
i) All matter is made of atoms. Atoms are indivisible and indestructible.
ii) All atoms of a given element are identical in mass and properties
iii) Compounds are formed by a combination of two or more different kinds of atoms
iv) A chemical reaction is rearrangement of atoms
Hence answer is
A) Atoms are rearranged but not changed during a chemical reaction
4) Electrons are relatively light about 1/1836 the mass of a proton.
Hence answer is
B) 2000 times larger than an electron
5) Isotopes any of two or more forms of an element, having the same number of protons in the nucleus, or the same atomic number, but having a different number of neutrons in the nucleus or different atomic weights. e.g. 1H1, 1D2
Atomic weight = No. of protons + No. of Neutrons
76 = 34 + No. of neutrons
No. of neutrons = 76-34 = 42
hence answer is
C) 42 Neutrons and 34 protons
6) Any given atom always represents as ZXA X is the element Z is the atomic number (No. Of protons or No. of neutrons) A is atomic weight 12Mg23
Atomic weight = No. of protons + No. of Neutrons
23 = 12 + No. of Neutrons
No. of Neutrons = 23-12 = 11
Hence answer is B) 12p, 11n, 12e.
Explanation / Answer
9. (2 points each) (a) Define the derivative f(a) (b) Discuss two ways of interpreting this number (e) Use the defnition of the derivative to find the derivative of J() 2r-1 (d) Sketch the graphs of the functions that do not have a derivative at some point.
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