PLS HELP ILL MARK BRAINLIEST!! 9. What are the three names commonly used to refer to the places where electrons can be
found?
10. Approximately,
manmade.
elements are found naturally on Earth. The others are
11. How does the Periodic Table organize elements? (2 answers)
12. The atomic number is
13. The atomic mass is
14. The Periodic Table is arranged in order of
The number of protons
Increases from left to right.
15. The vertical rows of the Periodic Table are called
All of the elements in a vertical row have similar characteristics.
I

Explanation:

9 The center of the atom is called the nucleus. Electrons are found in areas called shells. A shell is sometimes called an energy leve

12. 6

13. The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D).

14.Elements are arranged from left to right and top to bottom in order of increasing atomic number.

15.The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. A

10.Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94.

i thinking chemical change