Question

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2 Write down two differences between Group and period.
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Answer 1

Answer:

Explanation:

Periods and groups are the two important classifications that ancient chemists used to organize the iconic periodic table into columns and rows. Periods are the horizontal rows while the groups, also called families, are the vertical columns. The elements were arranged into groups and periods based on certain characteristics such as chemical/physical properties for groups and electron configurations for the periods. The article unfolds further differences between the periods and groups.

Elements in a period share the highest unexcited electron energy level. There are more elements in some periods than others because the number of elements is determined by the number of electrons allowed in each energy sub-level.  

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Elements in a group share a common number of valence electrons. For example, all of the elements in the alkaline earth group have a valence of two. Elements belonging to a group typically share several common properties.

Answer 2

Answer:

1.periods are those when we count from left to r

right.

2.period's atom size increases when we move from left to right.

now, group

1. groups are those when we move up to down

2.groups have similar chemical or physical properties