Which two elements have the same number of valence electrons?

Na and Sr

Zr and H

O and S

Mg and P

How many moles of oxygen gas, o2, are in a storage tank with a volume of 1.000*105 l at stp?

State the rules governing the number of significant figures that result from each of the following operations addition and subtraction; mutiplication and divison

When an acid and a base are mixed, the excess ions: This can be answered with more than one answer ... increase decrease neutralize each other combine to form water

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Pentacarbonyliron (0) (fe (co) 5) reacts with phosphorous trifluoride (pf3) and hydrogen, releasing carbon monoxide: fe (co) 5+2pf3+h2→fe (co) 2 (pf3) 2 (h) 2+3co if 6.0 g of fe (co) 5 reacts with 4.0 g of pf3 and 4.

What is the percent of H2O in a sample of a hydrate whose mass is 1.1290 g if the mass of water in the sample was 0.1660 g?

Why does conduction occur in solids and liquids easier compared to gases? Because the particles in gases are closer together and move slower Because the particles in gases are farther apart and move faster.

Write a balanced equation for the combustion of gaseous methane (CH4), a majority component of natural gas, in which it combines with gaseous oxygen to form gaseous carbon dioxide and gaseous water.

Pedro listed characteristics of two types of protists in a chart. Two Groups of Protists X Y Often multicellular Are usually autotrophic Include euglenoids Are heterotrophs Reproduce using spores Include different molds Which headings best complete

Which of the following is a characteristic of nonmetals? a. nonmetals are often shiny and hard. b. nonmetals are often malleable. c. Nonmetals do not conduct electricity. d. nonmetals are often ductile.