C. oxidation number D. mass number 19. Period 5 elements have an inner electron configuration of [Xe] 6. For potassium, which is located in period 4, the second ionization energy will remove an electron from the third energy level. D. Period 2 , group 1. Sulfur: Value given for monoclinic, beta form. False; 3.) click on any element's name for further information on chemical properties, environmental data or health effects.. Ask your questions now >> Applying to uni? 4. A.) Navigate by clicking the element on the table above or using the table below. Relative atomic mass of a light element up to calcium is approximately.....its atomic number. Group 8A elements have completely full outer principal shells. Thus, since the atomic mass of iron is 55.847 amu, one mole of iron atoms would weigh 55.847 grams. True; B.) Period 3 , group 17. The highest principal quantum number of period 2 element is 2. Which has more metallic character, Lead (Pb) or Tin (Sn)? From the periodic table you can see that carbon has an atomic number of 6, which is its proton number. Trend 2. 1. A. Na B. Si C. Cl D. Ar 20. As the elements of Period 2 are considered in succession from left to right, there is a general decrease in A. ionization energy B. electronegativity C. metallic character D. nonmetallic character 21. Group 1 metals are less reactive than group 2 metals. For rubidium, which is located in period 5, the second ionization energy will remove an electron from the fourth energy level. Boron is an element that is in period 2 on the periodic table and has an atomic mass of 10.81 The second ionization energy will have to remove an electron located on a lower energy level. Based on the periodic trends for ionization energy, which element has the highest ionization energy? Notes on the Melting Point of particular elements: Helium: Helium does not solidify at standard pressure. Period 4 elements have an inner electron configuration of [Ar] 3. Berkelium: Value given for alpha form. Carbon: Value given for diamond form. View Answer. They have low electron affinity. The atomic mass is useful in chemistry when it is paired with the mole concept: the atomic mass of an element, measured in amu, is the same as the mass in grams of one mole of an element. View Answer. Announcements Join Uni of Surrey for a live Q and A on personal statements, 5pm on Thursday! This list contains the 118 elements of chemistry. Example: Find the atomic mass of a carbon isotope which has 7 neutrons. Another trend is the increase in the radius of elements as we move down a column, while the number of valence electrons remains the same, even though the atomic number keeps increasing. The valence electrons of groups 5A elements are in the 6s subshell. Chemical elements listed by atomic mass The elemenents of the periodic table sorted by atomic mass. C. Period 2 , group 18. Page 1 of 1. Phosphorus: Value given for yellow phosphorus form. 5. 2. ALKALINE METALS. This is because the increase in electrons is paralleled by an increase in shells. View Answer. 4.) Group 2 elements are called alkaline metals because they form alkaline solutions, hydroxides, when reacting with water and their oxides are found in the earth’s crust. Which element in Period 3 has the greatest tendency to gain electrons? Element in period 2 with the highest ionisation energy? Answer. This table shows the pattern in the periodic table that Mendeleev developed and how the missing elements at that time could be predicted. B. Nitrogen has a larger atomic radius than oxygen. Electrons orbit the atom's nucleus in energy levels. Add the mass of protons and neutrons to compute the atomic mass of a single atom of an element. Find your group chat here >> start new discussion reply. Period 2 , group 17. Its valence shell contains 2 electrons; They have low electronegativity Watch. Classify each statement as true or false: 1. Fluorine (F) Nitrogen (N) Helium (He) 2.) Selenium: Value given for hexagonal, gray form.