Periodic Table- H=1.C=6,O=8
Hydrogen is H, Carbon is C, Oxygen is O
The elements in the modern Periodic Table are arranged according to their
#2 As the elements in Group 15 are considered from top to bottom, which sequence in properties occur? *
nonmetal --> metalloid --> metal
#3 Which set of elements have similar physical and chemical properties? *
helium neon, argon
#4 Which of the following best describes the element with atomic number 19? *
located in Period 1
#5 For any representative element, its group number equals *
the number of electrons in the highest occupied energy level (Ex: Group 1 elements all have one electron in the outermost energy level)
#6 Analyze the orbital filling diagrams below. Which diagram is filled incorrectly and which rule is being broken? *
The first diagram is filled incorrectly because it violates the Pauli Exclusion Principle.
The second diagram is filled incorrectly because it violates Hund's Rule.
The third diagram is filled incorrectly because it violates the Aufbau Principle.
The fourth diagram is filled incorrectly because it violates the Pauli Exclusion Principle.
#7 How many protons, neutrons, and electrons are in an atom of Fe-55? *
26 protons, 29 neutrons, 26 electrons
#8 Which best describes the principle energy level n=2? *
It contains two sublevels, s and p, and can hold a maximum of 8 electrons.
#9 Which of the following atoms require the least energy for the removal of the most loosely bound electron?
#10 When an excited electron jumps from the fourth to the second energy level, what type of electromagnetic radiation is emitted? *
not enough information
#11 Which of the following has the highest electronegativity and ionization energy, smallest radius and is classified as a halogen? *
#12 Using the graph below, what is the ionization energy of the noble gas? *
#13 Using the graph above, which required major part of the graph is missing? *
Three Different elements with atomic numbers 1,6 and 8
the answer is b. dilution
colorless gas, exhibiting a blue glow when placed in an electric field
its a type of rock