Table of Contents
What metalloid has only 3 energy levels?
Metalloids have from three to six electrons in their outer energy level. Boron, pictured in the Figure below, is the only metalloid with just three electrons in its outer energy level.
Which metalloid has 3 electron shells?
Boron Group
Group 13: Boron Group Boron is also the only metalloid in this group. The other four elements in the group—aluminum (Al), gallium (Ga), indium (In), and thallium (Tl)—are all metals. Group 13 elements have three valence electrons and are fairly reactive.
What are 3 metalloids on the periodic table?
The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium.
How many energy levels do metalloids have?
Metalloids have from three to six electrons in their outer energy level. Boron, pictured in the Figurebelow, is the only metalloid with just three electrons in its outer energy level. It tends to act like metals by giving up its electrons in chemical reactions.
What element has 3 energy levels and 7 valence electrons?
Chlorine is a member of the group of atoms on the periodic table called the halogens. They are all one electron away from the noble gases which are highly stable compounds. Chlorine has 7 valence shell electrons, 2 in the 3s orbital and 5 in the 3p orbital.
What are metalloids examples?
Elements which show some properties of metals and some other properties of nonmetals are called metalloids. Metalloids look like metals but they are brittle like non metals. They are also called as semi metals. Some important examples of metalloids are as follows : Boron(B), Silicon(Si) and Germanium(Ge).
What are 3 nonmetals on the periodic table?
Chemically, hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic and selenium are the non-metallic elements in the periodic table.
Where is Period 3 on the periodic table?
Period 3, or the third period, refers to the third row from the top of the periodic table.
What are metalloids give two examples Class 10?
Following are the elements that are considered to be metalloids:
- Boron (B)
- Silicon (Si)
- Germanium (Ge)
- Arsenic (As)
- Antimony (Sb)
- Tellurium (Te)
- Polonium (Po)
What element is the only metalloid with 3 valence electrons?
These elements are–not surprisingly–located in column 13 of the periodic table. This group includes boron, aluminum, gallium, indium, thallium, and ununtrium (B, Al, Ga, In, Tl, and Uut, respectively). These elements all have three valence electrons. Boron is the only metalloid in this family.
What kind of electrons are in Group 14?
Group 14 elements have 4 valence electrons. Group 15 elements have 5 valence electrons. Group 16 elements have 6 valence electrons. Group 17 elements have 7 valence electrons. Group 18 elements have 8 valence electrons. So from the description, you can conclude that the element described, with 7 valence electrons, must be in group 17.
Where are valence electrons found in a metal?
The valence electrons are those in the outermost energy level and are often used in bonding. Each family (or group or column) on the PT have a specific number of valence electrons. For example Group 1, the alkali metals, (Li, Na, K, etc.) have 1 valence electron. Group 2, the alkaline earth metals, (Be, Mg, Ca, etc.) have 2 valence electrons.
Why are period 2 elements in period 3?
Period 2 elements have their valence electrons in the second energy level, etc. So from the description, the element has three energy levels. It’s valence electrons must be in the third energy level, and therefore the element must be in Period 3 on the Periodic Table.
How many valence electrons does group 17 have?
Group 17 elements have 7 valence electrons. Group 18 elements have 8 valence electrons. So from the description, you can conclude that the element described, with 7 valence electrons, must be in group 17. Next you need to decipher what the three energy levels indicates.