1. Electrons of an atom are moving around the nucleus at what distance compared
ID: 1557945 • Letter: 1
Question
1. Electrons of an atom are moving around the nucleus at what distance compared to the radius of its nucleus?
1,000,000
100,000
1,000
100
2.An atom has 11 protons in a nucleus. What is the atomic number?
3
1
13
11
3. An atom has 11 protons in the nucleus of an atom. This is an atom of what element?
aluminum
lithium
sodium
hydrogen
4.What is the fundamental difference between the Bohr model of an atom and the quantum mechanical model?
Bohr model describes electrons in orbits; quantum model describes electrons in orbitals.
Bohr model describes electron with 1 quantum number; quantum model uses 4 quantum numbers.
Bohr model considers electron to be a particle; quantum mechanics considers it to be a wave.
5.Is an atomic number a whole number?
No, it cannot be a whole number because a nucleus contains neutrons as well as protons.
Yes, it can only be a whole number because it is the number of neutrons in an atom.
Yes, it can only be a whole number because it is the number of protons in an atom.
No, it cannot be a whole number because it can gain or lose electrons.
6. Is the mass of an isotope a whole number?
No, electrons do not contribute to the mass.
Yes, it is a whole number because it is the number of protons, neutrons, and electrons in an atom.
No, it is the relative mass of an isotope compared to carbon12.
Yes, it is a whole number because it is the number of protons in an atom.
7.Is the mass number a whole number?
Yes, it is a whole number because it is the sum of the number of protons, neutrons, and electrons in an atom.
No, the mass number is the mass compared to the mass of carbon12.
Yes, it is a whole number because it is the sum of the number of protons and neutrons in an atom.
No, it can gain or lose electrons, so it cannot be a whole number.
8.Is the atomic weight a whole number?
Yes, it is the weight of protons, neutrons, and electrons in an atom.
Yes, atomic weight is the weight of the protons.
No, it is the mass compared to the mass of carbon12, when weighted according to abundance in nature.
No, all protons do not have the same mass.
9.Why does the carbon12 isotope have a whole-number mass but not the other isotopes?
Carbon12 does not have a whole-number mass.
All isotopes have whole-number masses.
Carbon12 is assigned a mass of exactly 12.00 and the mass of other isotopes are compared to this mass.
10.What do the members of the noble gas family have in common? They
are mostly chemically inert.
almost never react with other elements.
have filled outer electron configurations.
11. What are the differences between the members of the noble gas family?
atomic number
atomic mass number
mass of isotopes
12.How are the isotopes of an element similar?
atomic number
atomic mass
atomic mass number
13.
atomic mass number
number of electrons
number of protons
atomic number
14. What patterns are noted in electron structures found in the elements of a family in the periodic table? They all have the same
atomic numbers.
atomic mass numbers.
outer orbital electron configurations.
15. sing any reference you wish, write the complete electron configurations for
(a) boron,
1s
4s
16. Explain how you know that the electron configurations
(a) boron = 1s2 2s22p1
(b) aluminum = 1s2 2s22p6 3s23p1
(c) potassium = 1s2 2s22p6 3s23p6 4s1
have the correct total number of electrons.
(a) Boron is atomic number and there are electrons.
(b) Aluminum is atomic number and there are electrons.
(c) Potassium is atomic number and there are electrons.
17. Refer to the figure below only and write the complete electron configurations for
(a) argon,
(b) zinc,
(c) bromine.
18. dentify the period and family in the periodic table for the following elements:
(select)IIIAIIIBVIIIBVAVIIIA
(select)IIAVBVAVIIAIA
(select)IVAIBIIBVAVIB
(select)VAVIIIBVIIIAIIIBIIIA
(select)VIIAIVAVIIIBIIAVA
(select)IAIVAVIIAVIIIBVA
19.
How many outer-orbital electrons are found in an atom of:
20. Match the following electron-dot diagrams with the proper atomic symbol.
(select)OCaKBrB
(select)BrKOCaB
(select)OCaKBrB
(select)BrBKOCa
1,000,000
100,000
1,000
100
18 ,' 4s / 4p / 4d / 4f /s, 5s / 5p/ 5d / 5f ,-6s/ ep / 6d / . 6f d, d, d ,-dExplanation / Answer
1) Radius of Atom = around 10^-10 m
radius of nucleus = 10^-15 m
So electrons are around 100,000 times away from the center than the radius of nucleus
2) Atomic number= Number of protons = 11
3) Sodium has 11 protons
4) last option, In bohr model electrons are particles and in quantum models we consider them as wave.
5) Yes, it can only be a whole number because it is the number of protons in an atom.
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