I believe it's called a compound.
A group of chemically bonded atoms is termed a molecule.
An element is a stand alone type of particle that is not bonded with any other element. A compound is a group of elements chemically bonded together like water being H2O and can only be separated by chemical means. A mixture is a group of compounds mixed together but they are not chemically bound to each other and can be separated by non-chemical means. The banana is made up of many compounds but is itself not a compound as those compounds are not bonded together chemically and can be mechanically separated. This makes the banana a mixture.
Metals in group one are chemically active as compared to the elements in group three and two. Elements like sodium, potassium, chlorine and fluorine are some of the chemically active elements.
yes
the vertical column is called group in the periodic table.
The Group 18 elements are called the noble gases or sometimes inert gases. Wikipedia has information on the noble gases, and a link is provided.
yes the most chemically reactive elements are in group 1
A phosphorus atom surrounded by and chemically bonded to each of four oxygen atoms is commonly called a "phosphate ion" if it is a triply charged anion or a "phosphate group" if present in a covalently bonded compound.
On the periodic table, the elements fall into groups (the vertical columns) which are often called families. The reason is that elements in a group are chemically similar to each other.
im sure the answer is a molecule. im not 100% sure but im sure its the correct answer
All of them tend not to react with each other until you get lower down the group
As group 2 is a group of quite reactive elements, most elements will react with them. However, as usual the inert gases of Group 0 will not react as they are highly unreactive.