Answer:
Sliding friction: A friction force that opposes the motion of an objects as it slides over a surface.
<span>iron has 26 protons and 30 neutrons are in the nucleus</span>
Answer:
Ca generally loses two electrons from its outer shell to form a Ca2+ ion.
Atomic mass Cu = 63.546 a.m.u
63.546 g ---------------- 6.02x10²³ atoms
22 g --------------------- ??
22 x (6.02x10²³ ) / 63.546 => 2.08x10²³ atoms
hope this helps!