Which of the following is/are true about an element with atomic mass 19? It 1 Bionic oxides
2 belongs to group II of the periodic table
3 forms ionic chlorides
.4. shows a valency of 2 in
its compound
which the following properties

Atank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. the values in the table show the volume v of water remaining in the tank (in gallons) after t minutes.t(min) 5 10 15 20 25 30v(gal) 694 444 250 111 28 0(a) if p is the point (15, 250) on the graph of v, find the slopes of the secant lines pq when q is the point on the graph with t = 5, 10, 20, 25, and 30.(b) estimate the slope of the tangent line at p by averaging the slopes of two secant lines.(c) use a graph of the function to estimate the slope of the tangent line at p. (this slope represents the rate at which the water is flowing from the tank after 15 minutes.)show all steps.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

More solar radiation is absorbed by earth’s surface than by