What is the created by this tilt and the Earth's orbital motion around the Sun?

Periodic but not oscillatory

Explanation:

The Orbital motion of the earth around the sun is not an oscillatory motion as it is not a two and Fro motion about a mean position. But it is a periodic motion.

a:

by the combination of an unlimited number of elements

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.