What are the organizing principles of the Modern Periodic Table of Elements?

Answer 1

The atomic number (number of protons). The groups (columns) are by similar characteristics and the periods (rows) are by electron shells/rings.

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Answer 2

Serenity Allen

The Modern Periodic Table of Elements is arranged according to the following principles: elements are grouped into groups (columns) and periods (rows) according to similarities in their electronic configurations and chemical properties; the atomic number, which denotes the number of protons in the nucleus of an atom, and the periodicity of chemical and physical properties as elements are arranged in order of increasing atomic number.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.