What this puzzle's columnar entries are taken from

Question:

Answer:

PERIODICTABLE

Length:

Similar Crossword Questions:

"Lid" in each of this puzzle's theme entries
People who bring you this puzzle's theme entries
Little ones who, they say, are made up of the ends of this puzzle's four longest entries
Act affectedly, and what this puzzle's theme entries do?
Need bailing, or what five entries in this puzzle can do to make two overlapping words or phrases
Quadrennial occasion celebrated by this puzzle's theme entries
How to communicate with any of the seven entries in this puzzle
Challenged, or what the theme entries in this puzzle should be
What this puzzle's theme entries have
What this puzzle's theme entries probably do?
Like crossword puzzle entries
They're hidden in this puzzle's theme entries
Piece of work found in this puzzle's longer entries
It can follow the last word of this puzzle's theme entries
Link buried in this puzzle's three longest entries
What this puzzle's theme entries take, vowel-wise
First of a pair of letters swapped six times in this puzzle's theme entries
A synonym for it can be found inside this puzzle's four longest entries
Levels that are split in this puzzle's theme entries
Charged particle taken from this puzzle's four longest entries
Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)
What the three theme entries in this puzzle are, in either of two ways
New Haven collegian hidden in this puzzle's longest entries
Just making things up, or a synonym for a three-word phrase describing this puzzle's theme entries
Soft stuff found in this puzzle's four longest Across entries