AVERAGE SMOKERS AROUND THE WORLD

GLOBAL STATISTICS OF AVERAGE SMOKERS  

COUNTRY	PERCENTAGE OF SMOKERS
NAURU	52.1
RUSSIA	26.8
AMERICA	11.5
AFRICA	10.3
SWEDEN	6

$\mathrm{}{\mathrm{}}^{\mathrm{}}$\[1. 10^{-24} Since grams are not a very convenient unit for measuring masses that tiny, scientists chose to define an alternative measure, the dalton or atomic mass unit (amu). A single neutron or proton has a weight very close to 1 amu. Electrons are much smaller in mass than protons, only about 1/1800 of an atomic mass unit, so they do not contribute much to an element’s overall atomic mass. On the other hand, electrons do greatly affect an atom’s charge, as each electron has a negative charge equal to the positive charge of a proton. In uncharged, neutral atoms, the number of electrons orbiting the nucleus is equal to the number of protons inside the nucleus. The positive and negative charges cancel out, leading to an atom with no net charge.