Multiple elements can be selected by holding the control key in the keyboard, elements can easily be selected with mouse and a red border will be present around each selected element.
For deleting the web forms it requires to go to the "Data Center" and press on the 'Delete Form' icon in the relevant form row.
a compound.
When atoms of more than one element chemically bonded together, they form a molecule. In some contexts, the you might answer that they form a compound.
Element M is calcium. It reacts with chlorine to form calcium chloride (CaCl2). Calcium is more reactive than magnesium and smaller than barium on the periodic table.
Allotrope
An allotrope is a form of an element which has a distinctly different molecular structure to another form of the same element.
If an element has less than four valence electrons, it will tend to lose its valence electrons and form cations. If an element has more than four valence electrons, it will tend to gain electrons and form anions. An element that has four valence electrons will tend to form covalent bonds rather than ionic bonds.
No element contains more than one element.
Element X is more reactive than lithium and magnesium because it has a higher tendency to lose electrons and form positive ions, making it more likely to react with other substances.
Many of the planets have more than one element. Two of these planets that have more than one element are Earth and Jupiter.
A displacement reaction is a type of chemical reaction where a more reactive element displaces a less reactive element from a compound. This occurs when the more reactive element has a greater tendency to lose electrons and form positive ions than the element it displaces. The displaced element is often in elemental form.
I would expect Carbon to be the element that forms more compounds than any other element.
Sodium forms 1 type of ion; namely, Na+.