The atomic and mass numbers for four different atoms are given below. which two are isotopes? atom atomic# mass# w 50 117 x 50 119 y 51 119 z 52 117

Atom W and atom X are isotopes.

Explanation:

Isotopes are defined as the substances which have same atomic number but different mass number.

We are given:

For atom W:

Atomic number = 50

Mass number = 117

For atom X:

Atomic number = 50

Mass number = 119

For atom Y:

Atomic number = 51

Mass number = 119

For atom Z:

Atomic number = 52

Mass number = 117

As, atom W and atom X have same atomic number. Thus, they are isotopes.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.