Periodic table

4. Particles in the nucleus with a positive charge of 1+
5. Elements that are shiny, malleable, ductile, are good conductors, and are solid at room temperature
6. The only non-metal found on the left side of the stair-step line
7. Substances that are made up of alike atoms
8. Capital letter or capital letter with 1 or 2 lowercase letters
11. Group 18
13. Rows on a periodic table
15. Line of metalloids, starting under Boron
18. Number of rings surrounding a nucleus
19. Particles in the nucleus that are electrically neutral
20. Number of protons in an element

1. Columns on a periodic table
2. Smallest partical of an element that retains the element's properties
3. Group 17
9. Atoms of the same element that have different numbers of neutrons
10. The positively charged center of the atom
12. Number of protons and neutrons in a nucleus
14. Group 1
16. Number of electrons allowed in the innermost outer orbit
17. Particles with a negative charge of 1- that occupy the space around the nucleus