Question

Please help me with this!

These 2 subatomic particles are found in the nucleus of an atom.

How many electrons can the second energy level hold?

The periodic table is organized so that the _____ properties of the elements repeat in a regular way.

Where are valence electrons located?

What is electro negativity?

Which column of the periodic table contains elements that are not reactive?

Answer 1

Protons and Neutrons are found in the nucleus, with only protons contributing a positive charge

The second energy level, n=2, can hold up to 8 electrons. 2 in the s orbital, and 6 in the p orbitals

Physical properties

Valence electrons are located in the outer most shell

Electronegativity measures the tendency an atom attracts bonding electron pairs. Atoms with a high EN (fluorine, oxygen, nitrogen) have a high electron affinity as well.

The last column on the right (He, Ne, Ar, etc.) is the least reactive elements. These are known as the Noble Gases. Their nonreactive nature is because they all possess full valence electron shell. Having complete shells is highly stable, therefore none of these elements wish to attain or lose electrons.

Answer 2

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