Question

It left us
thinking
[Add
[Add a suitable
quesion tags]​

Answer 1

Answer:

block of the periodic table is a set of elements unified by the orbitals their valence electrons or vacancies lie in.[1] The term appears to have been first used by Charles Janet.[2] Each block is named after its characteristic orbital: s-block, p-block, d-block, and f-block.

A long periodic table showing, from left to right: the s-, d-, f-, and p-blocks. The f-block, normally shown as a footnote, here splits the d-block into two. While this splitting is the more common form in the literature, a minority advocates placing the f-block between the s- and d-blocks.[1]

The block names (s, p, d, and f) are derived from the spectroscopic notation for the value of an electron's azimuthal quantum number: shape (0), principal (1), diffuse (2), or fundamental (3). Succeeding notations proceed in alphabetical order, as g, h,

Answer 2

Answer:

It left us thinking, didn't it?

Explanation:

A question tag is a grammatical structure in which a declarative or an imperative statement is turned into a question by the addition of an interrogative fragment. For example, in the sentence "You're John, aren't you?", the statement "You're John" is turned into a question by the tag "aren't you".

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