Periodic Table
Classifying Elements
Periodic Trends
Potpourri
100
J.W. Dobereiner grouped elements in sets of three based on similar properties. What were these groups called?
Triads
100
All group B elements are known as _____________________.
transition elements
100
In which group in the periodic table do the elements have the highest electronegativity values?
7A
100
What type of ion forms if an atom loses an electron?
cation
200
How are elements arranged in the modern periodic table?
By increasing atomic number
200
Group 1A on the periodic table is known as the _______________
alkali metals
200
As you move from left to right across the second period of the periodic table ionization energy ____.
increases
200
What is the ion that would form if Aluminum obtained the electron configuration of a noble gas?
Al3+
300
The pattern of properties within a period that repeat as you move from left to right gives rise to the ____________________.
periodic law
300
Group 6A on the periodic table is known as the _______________
Chalcogens
300
What is the size of a calcium ion compared to a calcium atom?
The calcium ion is smaller.
300
How many electrons are present in the d sublevel of a neutral atom of rhodium?
7
400
Who grouped the elements on the periodic table by atomic mass? What was the error in this?
Dmitri Mendeleev - Some of the elements didn't fit into this pattern based on their properties so he broke his own classification rule.
400
What groups of elements are included in the representative elements?
Groups 1A - 7A
400
How does atomic size change within groups and across periods?
Atomic size increases from top to bottom within a group. Atomic size decreases from left to right across a period.
400
From which orbital in a magnesium atom is an electron transferred to form Mg2+?
3s
500
What are the three main groups of element. Identify at least one characteristic of each group.
Metals, nonmetals, metalloids Answers will vary.
500
Into what four classes can elements be sorted based on their electron configurations?
representative elements, noble gases, transition metals, inner transition metals,
500
Explain how electronegativity varies within a group and across a period.
Electronegativity decreases from top to bottom within a group. Electronegativity increase from left to right across a period.
500
Explain how ions form. Provide at least one example.
Ions form when an atom gains or loses electron(s). Electrons can only be lost from the outer shell. The amount that will be gained or lost depends on how many it will take to reach the electron configuration of a noble gas.
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