Pre-Exam 2 Homework with answers1) The primary substances of which all other things are composed areA) molecules.B) compounds.C) elements.D) electrons.E) protons.Answer: C2) Select the correct symbol for the element:aluminum3) Ca is the symbol for
4) What elements are in hydroxyapatite, Ca5(PO4)3OH , a major compound in human bones andteeth?5) Which of the following is a characteristic of the modern periodic table?A) A group is a horizontal row on the periodic table.B) A period is a column on the periodic table.C) The elements in each group have similar chemical properties.D) The B groups contain the representative elements.E) The A groups contain the transition elements.Answer: C6) Which of the following elements is a metal?
7) Which of the following elements is a nonmetal?8) Which of the following elements is a noble gas?9) What is the symbol of the element in Group 4A(14) and Period 2?A) BeB) MgC) CaD) CE) Si
Answer: D10) What is the symbol of the element in Period 4 and Group 2?11) The smallest particle of an element that retains the characteristics of the element is a(n)12) Which of the following descriptions of a subatomic particle is correct?
- Fall '10