Why are some mystery elements easier to identify than other?

Which of the following is true about radio waves? they have short wave lengths they can penetrate dust clouds they have high energies they reveal hot gasses

When a bond Norma between two or more elements, what part of the atom is forming the bond?

What would happen if you took a really strong metal box and you started teleporting in hundreds and hundreds of small cotton balls until there is no space left and when you are 100% sure there is no more space left u teleport in a small metal ball.

Norway, Sweden, and Finland (Scandinavia) have what kind of climates?

Acceleration is defined as

Which of the following best describes each particle? A. Protons are negative, neutrons are neutral, and electrons are positive. B. Protons are neutral, neutrons are positive, and electrons are negative. C.

During World War II, both the Allied and Axis powers used propaganda to A. weaken public support for the war. B. downplay public opinion. C. manipulate the public through the use of humor. D. shape public support of the war

What type of simple machine is a hand drill? A) pulley B) wedge C) ramp D) screw

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L