Concept explainers
a)
Interpretation:The name, atomic symbol and group number of the element
Concept introduction:Total number of protons in an element is known as its
To maintain neutrality of a nucleus, number of protons and number electrons should be same.The group number is vertical axis in a periodic table. There are 18 groups in a periodic table.
Metals are elements which readily forms positive ions and shows conductivity. Non- metals are elements that don’t show conductivity like metals. Metalloids show properties in between metals and non-metals.
a)
Explanation of Solution
Atomic number of germanium is 32 in accordance with the modern periodic table.
Atomic symbol of germanium is
Formula to calculate group number of an atom is as follows:
Number of electrons in last p subshell of germanium is 2.
Substitute the value in the above equation.
So, it will be placed in the 14th group of the periodic table.
The elements that touch the staircase type are considered as metalloids.Hence.germanium touches the staircase type. So, it will be metalloid.
b)
Interpretation: The name, atomic symbol and group number of the element
Concept introduction:Total number of protons in an element is known as its atomic number and it is represented with symbol
To maintain neutrality of a nucleus, number of protons and number electrons should be same. The group number is vertical axis in a periodic table. There are 18 groups in a periodic table.
Metals are elements which readily forms positive ions and shows conductivity. Non- metals are elements that don’t show conductivity like metals. Metalloids show properties in between metals and non-metals.
b)
Explanation of Solution
Atomic number of phosphorous is 15 in accordance with the modern periodic table.
Atomic symbol of phosphorous is
Formula to calculate the group number of an atom is as follows:
Number of electrons in last p subshell of phosphorous is 5.
Substitute the value in the above equation.
So, it will be placed in 15th group of the periodic table. Phosphorous doesn’t touch the staircase type and placed right of the staircase. Hence, it is non-metal.
c)
Interpretation: The name, atomic symbol and group number of the element
Concept introduction:Total number of protons in an element is known as its atomic number and it is represented with symbol
To maintain neutrality of a nucleus, number of protons and number electrons should be same. The group number is vertical axis in a periodic table. There are 18 groups in a periodic table.
Metals are elements which readily forms positive ions and shows conductivity. Non- metals are elements that don’t show conductivity like metals. Metalloids show properties in between metals and non-metals.
c)
Explanation of Solution
Atomic number of helium is 2 in accordance with the modern periodic table.
Atomic symbol of helium is
All noble gases are placed in 18th group of the modern periodic table.
Helium doesn’t touch the staircase type and placed right of the staircase. Hence, it is non-metal.
d)
Interpretation: The name, atomic symbol and group number of the element
Concept introduction:Total number of protons in an element is known as its atomic number and it is represented with symbol
To maintain neutrality of a nucleus, number of protons and number electrons should be same. The group number is vertical axis in a periodic table. There are 18 groups in a periodic table.
Metals are elements which readily forms positive ions and shows conductivity. Non- metals are elements that don’t show conductivity like metals. Metalloids show properties in between metals and non-metals.
d)
Explanation of Solution
Atomic number of lithium is 3 in accordance with the modern periodic table.
Atomic symbol of lithium is
Formula to calculate the group number of an atom is as follows:
The number of electrons in the last s subshell is 1.
Substitute the value in the above equation.
So, lithium will be placed in the 1st group of modern periodic table
elements that placed left to the staircase are considered as metals.Here lithium doesn’t touch the staircase type and placed left of the staircase.So, it is a metal.
e)
Interpretation: The name, atomic symbol and group number of the element
Concept introduction:Total number of protons in an element is known as its atomic number and it is represented with symbol
To maintain neutrality of a nucleus, number of protons and number electrons should be same. The group number is vertical axis in a periodic table. There are 18 groups in a periodic table.
Metals are elements which readily forms positive ions and shows conductivity. Non- metals are elements that don’t show conductivity like metals. Metalloids show properties in between metals and non-metals.
e)
Explanation of Solution
Atomic number of molybdenum is 42 in accordance with the modern periodic table.
Atomic symbol of molybdenum is
Molybdenum is present in 6th group of periodic table. Elements that are placed left to staircase are considered as metals. Molybdenum doesn’t touch staircase type and placed left of the staircase.So, molybdenumis a metal.
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Chapter 2 Solutions
Principles of General Chemistry
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