Which of the following is an asteroid? A: A shooting star B: A big chunk of space rock C: A small comet D: A small meteor

B: A big chunk of space rock

Explanation:

asteroids are basically known as minor planets.

whereas shooting star is some dust burning while entering earths atmosphere.

on the other hand comet is some icy material consisting of gases.

and meteor is a very very small rocky or metallic body.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.