calculates the mass in kg of a granite parallelepiped (d = 2.75g / cm³) which has the following dimensions: 40 cm; 20cm; 9cm

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron

The bone of a dinosaur and the imprint of a leaf are examples of which kind of fossils? a) index b) body c) amber d) trace