__ is the Greek Pre-Socratic Philosopher who said that one cannot step into the same river twice.

Socrates considered himself:

Socrates says in Plato’s Phaedo:

Of the elements: Li, Na, K, Rb, and Cs, the element with the most metallic character is

The number of electrons in the outer energy level of a neutral atom of boron (atomic number 5) is

Which of the following properties is NOT a characteristic of the Group 1A (1) elements (alkali metals)?

When 2610 + 11.7 + 0.22 are added, which of the following expresses the answer to the correct number of decimal places?

Which of the following is the correct electron-dot structure for carbon?

Select the correct symbol for the element. iron

The measurement of the gravitational pull on an object is its