Question

64Chapter 7 Atomic Number and Atomie Mass The Periodie Table of Elements contains th and atomie wumber of protons, e atomic m number of each element. These numbbers indicate the neutrons, and electrons in each element's basic wtructure Each aquare in the Periodic Table represents an element There are two numbers in each square 3 Alomic Number The smaller number at the top of the box is the atomic number The number at the bottom of the box is the average of all inotopes of the element. Ifyou "round off this value to the neareat whole number, then that number is the atomie mass. On yoar Abbreviated" Periodic Table we have provided the rounded off atomic masses 6.9R Rounded off to 7 a the Atomic M Atomic Number # of Protons Atomic Mass or Protons + "of Neutrons A single atom has an overall neutral charge because the number of charges (protons) is equal to the number of - charges (electrons) in the atom. Hint: Ifyou know the atomic number, then you automatically know how many protons or electrons are in that atom. This is because the number of protons is equal to the number of electrons. QUESTION I. Using the "Abbreviated" Periodic Table of Elements, put the appropriate symbol by the element's name, and determine the number of protons, electrons, and neutrons Element Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Symbol # of Protons | # of Electrons -of Neutrons 2. Use the chart you just completed to answer the following questions. a. What is the atomic number for carbon? b. What is the atomic mass for lithium? e. what is the atomic number for nitrogen? d. What is the atomic mass for oxygen?_

Answer 1

Elements	Symbol	# of protons	# of electrons	# of neutrons
Lithium	Li	3	3	4
Berylium	Be	4	4	5
Boron	B	5	5	6
Carbon	C	6	6	6
Nitrogen	N	7	7	7
Oxygen	O	8	8	8
Fluorine	F	9	9	9

Atomic number of carbon = 6

Atomic number of nitronen = 7

Atomic mass of lithium = 6.9

Atomic mass for oxygen = 15.9