Which of the following electron configurations is correct?

a. Sc, 1s22s22p63s23p64d14s2

b. Cl, 1s22s22p63s23p5

c. Ca, 1s22s22p63s23p63d2

Which physical method can be used for obtaining a sample of solid from a small beaker of salt water? A. Evaporation B. Distillation C. Filtration D. Sorting

Which event always involves a chemical change? boiling melting conducting burning

Based on its chemical formula, which of the following substances is an organic compound

Why is it important to break up any lumps in baking soda before you place vinegar or water in it?

A mixture of hydrogen and nitrogen gases is placed in a 1.0 L reaction vessel and the reaction is allowed to reach equilibrium at 700K. At equilibrium, it is found that the reaction vessel contains 1.6981 moles of H2, 0.5660 moles of N2, and 0.

Luis set a glass of ice water out side is the sunshine. when he looked at the glass 10 minutes later, the contents had changed. what kind of change happened to the ice water? A. evaperation B. conduction C. chemical change d. sudden change

A substance is considered to have a smaller surface area when ... A. it is a fine powder B. it is in large chunks C. you have a small amount of the substance D. you have a large amount of E. the substance

Which is the noble gas notation for chlorine? A-[Ne] 4s2 4p5 B-[Ne] 3s2 3p5 C-[Ne] 3s2 3p3 D-[Ne] 3p2 3p5

Is argon long hand or noble gas

Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five simplest elements, why are they rare compared to many heavier elements?