For an atoms electrons, how many energy sub levels are present in the principal energy level n=4?

A. 4

B. 9

C. 10

D. 16

E. 32

Ca2 + gains 2e - now it has

A significant limitation for early scientists studying the elements was

You have a piece of gold and you cut it into smaller pieces. If you could continue cutting, you would eventually separate the gold into tiny pieces that could no longer be divided without losing their gold-like properties.

For which blocks of elements are outer electrons the same as valence electrons? For which are d electrons often included among valence electrons?

When would you want to be at the beach during a spring tide?

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?