Chapter 2, Problem 99GQ

Crossword Puzzle: In the 2 × 2 box shown here, each answer must be correct four ways: horizontally, vertically, diagonally, and by itself. Instead of words, use symbols of elements. When the puzzle is complete, the four spaces will contain the over-lapping symbols of 10 elements. There is only one correct solution.

Horizontal

1–2: two-letter symbol for a metal used in ancient times

3–4: two-letter symbol for a metal that burns in air and is found in Croup 5A

Vertical

1–3: two-letter symbol for a metalloid

2–4: two-letter symbol for a metal used in U.S. coins

Single squares: All one-letter symbols

1: a colorful non-metal

2: colorless, gaseous non-metal

3: an element that makes fireworks green

4: an element that has medicinal uses

Diagonal

1-4: two-letter symbol for an element used in electronics

2-3: two-letter symbol for a metal used with Zr to make wires for superconducting magnets

This puzzle first appeared in Chemical & Engineering News, p. 86, December 14, 1987 (submitted by S. J. Cyvin) and in Chem Matters, October 1988.