Answer: for question 4, the answer would most likely be movement of air, water and rock
Explanation:
Answer:
28
Explanation:
it states that the atom is neutral, meaning the number of electrons and protons are the same. so if there are 13 electrons, there are 13 protons. And the mass number is neutrons plus protons. So 13+15 is 28
Answer:Sunlight travels through space without the aid of fluids or solids
Explanation: Radiation involves transfer of energy or heat with the help of electromagnetic waves.
For example, radiations from Sun help in transfer of energy or heating of object on which it falls. Like, when radiations are falling on a metal rod then after sometime the rod becomes hot due to absorption of radiations from the Sun.
Answer: The correct answer is mass number.
Explanation:
An isotope is a chemical compound of the same element which only differ in the number of neutrons. The number of protons and electrons remain same for two isotopes. This means isotopes have different mass number but have same atomic number.
When we write an isotope, the number at the end of the isotope's name is the mass number.
When writing an isotope: Chlorine-35, the number 35 represents the atomic mass and not atomic number.
Hence, the correct answer is mass number.
The two compounds present
in unpolluted air are carbon dioxide and water. You may think that carbn
dioxide is a greenhouse gas, yes it is and at the same time not. There animals
in the earth that produces carbon dioxide into the atmosphere, the carbon
dioxide too, is also need for plan respiration.