Using only the Aufbau (Building-Up) Principle, show the electron configuration of chromium (Cr). The atomic number of chromium is 24. Select one: a. 1s22s22p63s23p64s23d4 b. 1s22s22p63s23p64s24p4 c. 1s22s22p63s23p64s13d5 d. 1s22s22p63s23p64s23d3 e. 1s22s22p63s23p64s23d6

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i need help matching the letters to the right answer.

16. What charge will a cation formed from strontium have? Select one: a. none of these b. -3 C. -1 d. -2 e. +1

Which of the following statements concerning the periodic table is incorrect?   a. All the elements are arranged in order of increasing atomic weight.   b. Mendeleev left spaces in his periodic table for undiscovered elements.   c. The chemical characteristics of the elements are periodic functions of their atomic numbers.   d. Mendeleev received most of the credit for the early development of the periodic table.   e. The elements in a given group or family have similar chemical properties.

The vast majority of the ISM, both by volume and by mass, is made up of this element, found at many different densities and temperatures.   Select one: A. carbon B. iron C. hydrogen D. water E. helium

identify this element in the periodic table 200 A 84

Write the complete electron configuration for the follwing. a. sulfur b. potassium c. nickel d. xeon

25. Classify each of the following elements as a (an) alkali metal, alkaline earth metal, transition metal, halogen, noble gas, or metalloid. Draw lines connecting elements in this table that have similar properties. a. sodium b. germanium c. calcium d. fluorine e. xenon f. copper g. chlorine h. silicon i. potassium j. magnesium

A. A main group element with the valence electron configuration 3s is in periodic group 2 It forms a monatomic ion with a charge of B. A main group element with the valence electron configuration 4s-4p* is in periodic group 6 It forms a monatomic ion with a charge of