Concept explainers
An
- (a) Identify the element and give its symbol.
- (b) Give the element’s
atomic number . - (c) Give the mass number of the isotope.
- (d) This element has two naturally occurring isotopes. Given the information in the table, calculate the atomic weight of the element.
- (e) In which region of the periodic table is the element found? Explain your answer.
- (f) Is the element a metal, metalloid, or nonmetal? Explain your answer.
- (g) This element, used in compact fluorescent light bulbs and computer screens, has an atomic radius of 180 pm. Calculate how long the chain of atoms would be if all the atoms in a 1.25-mg sample of this element were put into a row.
(a)
Interpretation:
The isotope of an element contains 63 protons and 91 neutrons. The element has to be identified and the symbol of the element has to be given.
Explanation of Solution
Number of protons of the element is 63.
Number of neutrons of the element is 91.
The atomic number is same as that of number of protons, 63. Also the number of protons is same as that number of electrons in an uncharged atom. The element is Europium with a symbol of
(b)
Interpretation:
The atomic number of element with 63 protons and 91 neutrons has to be given.
Explanation of Solution
Number of protons of the element is 63.
The atomic number is same as that of number of protons, 63.
Atomic number
(c)
Interpretation:
The mass number of the isotope with 63 protons and 91 neutrons has to be given.
Explanation of Solution
Number of protons of the element is 63.
Number of neutrons of the element is 91.
Atomic number
Mass number is the sum of atomic number of the element and number of neutrons.
Isotope’s mass number
(d)
Interpretation:
The element has two naturally occurring isotopes. From the table given the atomic weight of the element has to be calculated.
Explanation of Solution
Every 10000 atoms of the element contain 4780 atoms of the
(e)
Interpretation:
The region in which the element is found in periodic table has to be explained.
Explanation of Solution
The element is found in the lanthanide series because it shows up in the row labeled “Lanthanides”.
(f)
Interpretation:
The given element is a metal, metalloid or non-metal has to be found and the answer has to be explained.
Explanation of Solution
The element Europium is a transition metal.
(g)
Interpretation:
The element given has an atomic radius of
Explanation of Solution
The atomic radius is
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Chapter 2 Solutions
Chemistry: The Molecular Science
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