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Vocabulary, picture, sentence:
1. Alkali Metals- the elements in Group 1 of the periodic table; they are the most reactive
metals; their atoms have one valence electron.
Alkali metals are very reactive.
2. Alkaline Earth Metals- the elements in Group 2 of the periodic table; they are very
reactive metals but are less reactive than alkali metals; their atoms have two valence
electrons.
Alkaline earth metals are very reactive.
3. Halogen- the element in Group 17of the periodic table; they are very reactive nonmetals; their atoms have seven valence electrons.
Halogens are in group 17.
4. Inner Transition Elements- two series of elements; lanthanoids&actinoids.
Inner transition metals are different.
5. Lanthanide Series- shiny, reactive transition metals that follow the element lanthium in
period 6 o the periodic table.
Lanthanide series are part of the inner transition elements.
6. Actinide series- transition metals that follow the element actinium in Period 7 of the
periodic table; all actinides are radioactive.
Actinide series are part of the inner transition.
7. Noble gases- any of the gaseous elements helium, neon, argon, krypton, xenon, and
radon occupying Group 0 (18) of the periodic table.
Noble gases are in group 18.
8. Transition Elements- metals in groups 3-12 of periodic table; these metals are less
reactive than alkaline-earth metals.
Transition metals are in groups 3-12.
9. Representative elements- metallic elements found on the left side and in the center of
the periodic tale.
Representative elements are on the left.
10. Chemical family- groups of elements put together because of their similarities.
Chemical families are like groups.
11. Atomic number- the number of protons in the nucleus of an atom of an element.
The atomic number is the number of protons.
12. Periodic table- arrangement of elements into rows and columns according to similarities
in their properties.
The periodic table has the elements in it.
13. Protons- positively charged subatomic particle found in the nucleus of an atom.
Protons are positive.
14. Neutrons- subatomic particle with no charge and a mass of 1 amu; found in the nucleus
of the atom.
Neutrons don’t have a charge.
15. Electrons- negatively charged subatomic particle.
Electrons are negative.
16. Subatomic particle- particles smaller than an atom.
Subatomic particles are small.
17. Nucleus- the dense central portion of an atom, composed of protons and neutrons.
The nucleus is in the middle of the atom.
18. Electric charge-physical property of matter that causes it to experience a force when
near other electrically charged matter.
Electric charges cause force.
19. Valence electrons- an electron in the highest occupied energy level of an atom.
Valence electrons are on the outer ring.
20. Atomic mass- weighed average of the masses of the isotopes of an element.
Atomic mass is the weight.
21. Groups- vertical column of elements in the periodic table; the constituent elements of a
group have similar chemical and physical properties.
Groups are the vertical columns.
22. Periods- horizontal row of elements in the periodic table.
Periods are horizontal.
23. Metals- one of a class of elements that includes a large majority of the known elements;
metals are characteristically lustrous, malleable, ductile, and good conductors of heat
and electricity.
Metals are ductile.
24. Non-metals- one of a class of elements that are not lustrous and are generally poor
conductors of heat and electricity; nonmetals are grouped on the right side of the
periodic table.
Nonmetals are not lustrous
25. Metalloids- one of a class of elements having properties intermediate to metals and
nonmetals.
Metalloids are intermediate to metals and nonmetals.
26. Chemical system- an integrated whole, composed of diverse, interacting, specialized
structures and subfunctions.
Chemical system is an integrated whole.