When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. which property of the unknown element determines the other elements it reacts with? *
1 point
a. the total number of neutrons in the unknown element
b. the total number of particles in the nucleus of the unknown element
c. the number of protons in the nucleus of the unknown element
d. the number of valence electrons in the unknown element

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

What four properties do all waves have in common