Positrons are spontaneously emitted from the nuclei of

(1) potassium-37 (3) nitrogen-16

(2) radium-226 (4) thorium-232

A metalloid has properties of A. both solids and liquids. B. both gases and liquids. C. both metals and non-metals. D. both elements and compounds.

Which electron configuration represents the electrons of an atom in an excited state? (1) 2-1 (3) 2-8-7 (2) 2-7-4 (4) 2-4

Which of the following is not true about compounds? Compounds are combinations of elements that join in specific ratios. A specific compound always has the same mass ratio of its components. Elements can combine in any proportion to form a compound.

Carbon can share a maximum of how many of its valence electrons when bonding to other atoms? 2 4 6 Cannot be determined

What is water displacement?

The total number of valence electrons in the phosphate ion is

The reaction below has an equilibrium constant kp=2.2*106 at 298 k. 2cof2 (g) ⇌co2 (g) + cf4 (g) calculate kp for the reaction below. cof2 (g) ⇌12co2 (g) + 12cf4 (g)

The electrical conductivities of the following 0.100 M solutions were measured in an apparatus that contained a light bulb as the indicator of conductivity. Rank the solutions in order of decreasing intensity (brightest to dimmest) of the light bulb.

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

Why is it harder for the earth to recover from some natural disasters now? A) Human influence may compound the damage. B) The natural disasters have gotten worse. C) This statement is not true.