Some elements have one because they are only based on one pure element. Like Hydrogen, we can get that from the air. Make sense?
two numbers with a product of 1 are called elements
SO4 contains the elements sulphur and oxygen in the respective ratios of 1:4.
group 1 elements
The two most common elements in the Universe, and in most stars are - in that order - hydrogen and helium (elements #1 and #2).
There are only two elements that comprise water, Hydrogen and Oxygen.
The two elements in periodic table which are liquid are: 1 mercury 2 bromine
Alkali metals (group 1 elements) have one valence electron. Hence have one ionization energy Alkaline earth metals (group 2 elements) have two valence electron. Hence have two ionization energy
Group 1 elements are metallic in nature. They have 1 electron in their outermost octet.
All the natural element are elements 1 through 92, or Hydrogen through Uranium. However, there are two exceptions: Promethium and Technetium, elements 43 and 61, which for some reason are strictly synthetic, or unable to be formed in nature.
Some examples of molecules mad up by two different elements include: Water= 2 parts Hydrogen, 1 part Oxygen = H2O Carbon dioxide= 1 part Carbon, 2 parts Oxygen = CO2 Methane = 1 part Carbon, 4 parts Hydrogen = CH4 Magnesium Oxide = 1 part Magnesium, 1 part Oxygen = MgO Potassium Bromide = 1 part Potassium, 1 part Bromine = KBr
The elements in silver bromide are silver (Ag) and bromine (Br). Silver bromide is a chemical compound made of these two elements in a 1:1 ratio.
Some examples of molecules mad up by two different elements include: Water= 2 parts Hydrogen, 1 part Oxygen = H2O Carbon dioxide= 1 part Carbon, 2 parts Oxygen = CO2 Methane = 1 part Carbon, 4 parts Hydrogen = CH4 Magnesium Oxide = 1 part Magnesium, 1 part Oxygen = MgO Potassium Bromide = 1 part Potassium, 1 part Bromine = KBr