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 overlapping 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 Group 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 nonmetal
2: Colorless, gaseous nonmetal
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

Transcribed Image Text:

1 3 2 4