Place the elements in order from smallest to largest atomic number. PLS HELPPP

What is a property of a double replacement reaction

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h

Can someone me with 6 to 10 plz this is for masteries test.