Section 2.1 Elements - Atom - Figure 2.1 – What does the periodic table show? Subatomic particles: see Figure 2.3 Particle Mass (a.m.u.) Charge Location sotope – Section 2.2 What is the major topic of this section? What three types of bonds are discussed in this section? (See table 2.1) What is the difference between a covalent bond and an ionic bond? (See Figures 2.5 and 2.6) Describe the shape of a water molecule and explain why the molecule is "polar". (Figure 2.7) Hydrogen bond - pg. 3

Given the following (fictional) ions: cations anions D+1 M1 E+2 (LB4) 2 (ZG2)*3 (ZEm) 2 At3 R 3 Write the balanced chemical formula for the ionic compound that would form between the following pairs of ions. a) ZG2 and D*1 b) A and LB4

Write the chemical formula for the following compound. Isthe compound ionic or molecular? Name the compound.[Sections 2.6 and 2.8]

6. How many Cu atoms are in 4.14 x 10' u?

5. net charge Which of the following are: A. Molecules but not compounds B. Compounds but not molecules C. Both compounds and molecules Write only the letter of your choice. (a) SO₂ (c) Cs (b) Sg (d) N₂O5 (e) (f) O 0₂ (g) (h) CH4 KBr 0 (i) P4 (j) LiF

QUESTION 1 Fill in the missing information: formulas for missing compounds and ions, systematic/modern names of compounds, and whether the compound is ionic (I), covalent (C) or both (B). { NOTE: i) Write subscript numbers in the formulas as if you are writing letters in a word (e.g., Mg3N2 should be written as Mg3N2). ii) Do not put parentheses around monatomic ions but put them around a polyatomic ion if there is more than one in the formula (e.g. Na2C03 should be written as Na2CO3 but Ca(NO3)2 as Ca(NO3)2. )} (Use the letters I, C, or B to indicate the type of bonding in the compound.) Compound Formula Name of compound lonic (I), Covalent (C) or Both (B)? lons 2- 1+ NH 4 & SO 4 4+ Sn & CI 1- 2+ Fe & CH 3 CO0 1- AI 3+ & p 3- AIP

Give the ion symbol for each ion. a. barium ionc. oxidee. lead(IV) b. iron(II)d. ferrous f. cobalt(III)

One compound of elements X and Y contains 35.2% X (by mass); another compound contains 24.6% X. b) If molecules of the first compound contain three atoms of Y per atom of X, how many atoms of Y per atom of X are there in molecules of the second compound?

How many protons and electrons are present in each ion? a. Ni 2 + b. Se 2 − c. Fe 3 +