Question

periodic table worksheet
choose answers from this list: terms may be used more than once, or not at all!
atoms electrons neutrons protons
atomic number isotopes nucleus valence electrons
mass number groups periods metals
non - metals transition metal metalloids halogens
alkali metal alkaline earth metal cation anion

1. the columns that make up the periodic table are called
2. the rows of the periodic table are referred to as
3. elements are made up of _, which are the smallest unit of matter that retains the characteristics of the element.
4. atoms have a _ at the center which contains _ and _.
5. _ have a single positive charge.
6. _ are neutral subatomic particles.
7. neutral _ have an equal number of _ and _.
8. the _, is the number of protons in an atom.
9. the _, is the number of protons plus neutrons in an atom.
10. the number of _, also called the _, determines the identity of an element.
11. elements that have the same number of protons but different numbers of neutrons, are called _ of the same element.
12. the electrons that are located in the outermost electron shell are called _.
13. when an atom gains electrons it becomes a _.
14. when an atom loses electrons it becomes a _.
15. _ typically form cations.
16. _ typically form anions.
17. _ and _ react to form ionic compounds.
18. _ and _ react to form molecular compounds.
19. gr ia elements are commonly referred to as: _.
20. gr 2a elements are commonly referred to as: _.
21. the element chlorine belongs to a group commonly referred to as the: _.
22. tungsten is a member of the _ elements.
23. si, ge and te belong to a collection of elements classified as _.
24. _ are generally poor electrical conductors.
25. elements that are characterized as ductile and malleable are best classified as _.

Explanation:

1. Columns in periodic table are groups.
2. Rows are periods.
3. Elements are made of atoms.
4. Atoms have nucleus with protons and neutrons.
5. Protons have positive charge.
6. Neutrons are neutral.
7. Neutral atoms have equal protons and electrons.
8. Atomic number is proton - count.
9. Mass number is protons + neutrons.
10. Protons (atomic number) determine element identity.
11. Same - proton, different - neutron elements are isotopes.
12. Outermost electrons are valence electrons.
13. Gaining electrons forms anion.
14. Losing electrons forms cation.
15. Metals form cations.
16. Non - metals form anions.
17. Metals and non - metals form ionic compounds.
18. Non - metals and non - metals form molecular compounds.
19. Group IA are alkali metals.
20. Group 2A are alkaline earth metals.
21. Chlorine is in halogens.
22. Tungsten is a transition metal.
23. Si, Ge, Te are metalloids.
24. Non - metals are poor conductors.
25. Ductile and malleable elements are metals.

Answer:

1. groups
2. periods
3. atoms
4. nucleus; protons; neutrons
5. protons
6. neutrons
7. atoms; protons; electrons
8. atomic number
9. mass number
10. protons; atomic number
11. isotopes
12. valence electrons
13. anion
14. cation
15. metals
16. non - metals
17. metals; non - metals
18. non - metals; non - metals
19. alkali metal
20. alkaline earth metal
21. halogens
22. transition metal
23. metalloids
24. non - metals
25. metals