Sabe-se que 5 g de hidrogênio reagem completamente com 40 g de oxigênio, formando água. Qual será a massa, em gramas de água formada, quando 35 g de hidrogênio reagir com oxigênio suficiente para completar a reação? a) 75 g b) 245 g c) 315 g d) 45 g e) 280 g

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl