Atoms and the Periodic Table Notes Directions: As you complete the nearpod notes, be sure to take notes on each slide.

Mendeleev’s Table:
Based upon the of the elements
Gaps in Mendeleev’s periodic table because they were (discovered/undiscovered) elements
Periodic Table Reorganized:
Organized by
Periodic law:
Periodic Table of the Elements Today:
Going across the periodic table the top numbers increase according to their
Groups:



Periods



Parts of an Atom:



Number of determines type of atom
Isotopes: What are they?
Atoms with the same number of of protons, but different numbers of
example:

Ions:What are they? Example: sodium atom= Na
If they gain electrons, they become
Na-1
If they lose electrons, they become
Na+1

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms