Can anyone help me?

Why when breaking in a car a normal balloon will travel forwards but helium balloon will travel backwards?

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how do you find out what the

how do you find out what the colors on the periodic table stand for?

The colors vary from chart

The colors vary from chart to chart, but in the Webelements version, the blue for columns 1 & 2 represent metallic elements whose valence electrons come from the s-orbitals; the yellow are non-metals, metalloids and metals whose valence electrons are found in the p-orbitals; the red represents transition elements whose valence electrons occupy the d-orbitals; the green elements are the lanthanide/actinide (lanthanoid/actinoid) rare earths whose valence electrons occupy the f-orbitals.

Its best to find the key...

Its best to find the key...

I am afraid a question like

I am afraid a question like this is not easily answered mainly because opinion is still divided on the matter.

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