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-Chemistry Help- 24PTS!

Fill in the Blank
1.) There are three known forms of hydrogen. These forms are called ------- of each other. Each of these forms will have the same number of -----but different numbers of ---- in their nuclei.

2.) Periods on the periodic table represent elements_____.

Select all that apply.
with the same number of valence electrons
with increasing number of valence electrons
with the same number of electron orbits
with increasing atomic size

Respuesta :

Isotopes are atoms of the same element that differ only by the number of neutrons in their nucleus. 

for the second one think about what the outer electrons of elements in the same period have in common




ohanapenner

Isotope: each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element

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