The periodic table is organized by rows and columns based upon the ________ and
The periodic table is organized by rows and columns based upon the atomic number and chemical properties of the elements.
columns are known as _______. (3) Every element in that column has the same number of electrons in the outermost (4) (4) shell, also called the _________ electrons.
columns are known as groups or families. Every element in that column has the same number of electrons in the outermost shell, also called the valence electrons.
he first group, 1A (1), are
(6) called the alkali metals.
(7) Each element has _______
(8) valence electron. These
(9) elements are all highly
(10) reactive.
The first group, 1A (1), are called the alkali metals. Each element has 1 (8) valence electron. These (9) elements are all highly (10) reactive.
The second group, 2A (2), are (12) the alkaline earth metals. (13) Each element has _______ (14) valence electrons. They react (15) easily but not as violently as (16) group 1A.
The second group, 2A (2), are the alkaline earth metals. Each element has 2 (14) valence electrons. They react (15) easily but not as violently as (16) group 1A.
Group 7A (17), the
(18) right of the periodic (19) table, is made up of (20) _______ gases. The (21) outer valence level is
(22) _______and the gases (23) are _______.
(25) halogens, like group 8A (line 26) (18) are also (27) __________, but these (28) elements have _______ (29) electrons in their (30) valence level. They do (31) react with other
(32) elements.
Element _________ # of valence
electrons ________ Group __________ Reactive? _______
(33) Transition ______, groups 3B-2B (3-12) have high (34) ______ and ______ points, are hard with high densities.
Element _________
# of valence
electrons ________
Group __________
Reactive? _______
Group 7A (17), the (18) right of the periodic (19) table, is made up of (20) halogen gases. The (21) outer valence level is (22) incomplete and the gases (23) are highly reactive.
(25) Halogens, like group 8A (line 26) (18), are also (27) nonmetals, but these (28) elements have 7 (29) electrons in their (30) valence level. They do (31) react with other (32) elements.
Element: Halogens
# of valence electrons: 7
Group: 7A
Reactive? Yes
(33) Transition elements, groups 3B-2B (3-12), have high (34) melting and boiling points, are hard with high densities.
Element: Transition elements
# of valence electrons: Varies
Group: 3B-2B (3-12)
Reactive? Varies