How many significant digits are in the number 1.0 × 10^3?​

What is the temperature of one mole of helium gas at stp?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which statement describes james chadwick’s discovery.