What is the periodic table?

a. a tool to organize the elements.

b. a list of properties of elements.

c. a method to name elements.

d. a table to record discoveries.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?