Proton = +
Electrion = -
Neutron = no charge
Add them up:
15 proton + 13 electrons = (+15) + (-13) = +2
Thirteen is spelled "thirteen" and fifteen is spelled "fifteen."
1-
A carbon atom always contains six protons. In nature, carbon most commonly has six (12C, carbon-12), seven (13C, carbon-13) or eight (14C, carbon-14) neutrons. However, man-made isotopes of carbon contain as few as two neutrons (8C) or as many as sixteen (22C). Thirteen of the fifteen isotopes of Carbon (i.e. all except 12C and 13C) are radioactive. In addition to neutrons and protons, a carbon atom always has six electrons in orbits around the nucleus.
195.
15% of 13 is 1.95
13 to 15 - thirTEEN to fifTEEN
thirteen thousand and fifteen dollars no cents
thirteen thousand and fifteen dollars no cents
Seven hundred fifteen million, four hundred thirteen thousand, sixty-eight.
no, three-fourths equals fifteen-twentieths, which is larger than thirteen-twentieths
A electrical voltage of Fifteen Volts.
thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen