What does the area between points D and E represent for the substance on the heating curve below? A freezing point
B melting point
C boiling point
D sublimation point

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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a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.