Elements Crossword

it's colourless / it's an essential element for life
it was the first gas used for filling balloons and dirigibles/ one of it's property is low density
the lightest of all the metals/has a melting point of 180.54 c
the symbol N and atomic number 7
makes up around 21% of the Earth's atmosphere and 50% of the mass of the Earth's crust.
It has the lowest liquid range of any element/It changes to reddish-orange colour in vacuum tube
it's atomic number is 15/ This element exists in several forms
does not have a melting point and remains solid until combustion occurs
it's atomic mass is 12.0107 u / and has six electrons
it contains 4 electrons and 4 protons, and it's atomic mass is 9
the symbol of this element is B, and it's mostly found in the Mojave Desert in California
It is physically silver coloured and is a soft metal of low density/ and it's not found naturally on earth because it is a highly reactive metal
it's the most reactive and the most electromotive of all the elements/ it is a pale yellow
has a atomic mass of 24.305, and also has 12 Neutrons
It is a silvery-white, soft, non-magnetic and ductile metal in the boron group.
used in the vulcanisation of natural rubber, as a fungicide, in black gunpowder, in detergents and in the manufacture of phosphate fertilisers.
can be found in both the Earth's crust and in ocean water.
used for treating high blood pressure, and preventing stroke/and helps to prevent kidney stones.
it's in dairy products like milk, cheese and yogurt.
atomic number is 18 and the symbol is Ar