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? _______
Element gallium
# of valence electrons 3
Group 3
Reactive? Yes
Element 33 has 3 valence electrons and belongs to Group 3B. It is not stated whether it is reactive or not.
Element 34 is a transition element, belonging to groups 3B-2B (3-12). These elements have high melting and boiling points, and are hard with high densities. The number of valence electrons for element 34 is not specified, and it is not mentioned which group it belongs to. It is also not stated whether it is reactive or not.
From the given information, it seems like there are two incomplete sentences or questions. Let's break down each one and fill in the missing details:
1. Element [missing information] # of valence electrons [missing information] Group [missing information] Reactive? [missing information]
To find the missing information, we can refer to the periodic table. Each element is assigned a unique atomic number that corresponds to its position on the periodic table.
For example, if the atomic number is 33, we can find the corresponding element by locating element number 33 on the periodic table. In this case, element 33 is arsenic (As).
Next, we need to determine the number of valence electrons for arsenic. The number of valence electrons is equal to the group number for representative elements (Groups 1-2 and 13-18), except for the transition metals. Arsenic is located in Group 15 (or Group VA) of the periodic table, so it has 5 valence electrons.
Regarding reactivity, elements in Group 15 tend to be moderately reactive because they have 5 valence electrons and can either gain 3 electrons to achieve a stable octet or lose 5 electrons to achieve a stable noble gas configuration.
2. Element [missing information] # of valence electrons [missing information] Group [missing information] Reactive? [missing information]
Similarly, let's find the missing information for the second element.
If the atomic number is 34, we can find the corresponding element by locating element number 34 on the periodic table. In this case, element 34 is selenium (Se).
Next, we determine the number of valence electrons for selenium. Selenium is located in Group 16 (or Group VIA) of the periodic table, so it has 6 valence electrons.
Regarding reactivity, elements in Group 16 tend to be moderately reactive because they have 6 valence electrons and can either gain 2 electrons to achieve a stable octet or lose 6 electrons to achieve a stable noble gas configuration.
Here is the completed information for both elements:
Element 1 (atomic number 33): Arsenic (As)
# of valence electrons: 5
Group: 15
Reactive: Moderately reactive
Element 2 (atomic number 34): Selenium (Se)
# of valence electrons: 6
Group: 16
Reactive: Moderately reactive