An unstable nucleus

a. increases its nuclear mass by fission
b. increases its half-life
c. emits energy when it decays
d. expels all of its protons

What are the similarities of physical and chemical change ?

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel