<em>Answer:</em>
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<em>6</em><em> </em><em>m/</em><em>s</em></h2>
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<em>hope </em><em>this </em><em>helps.</em><em>.</em>
The answer is b) false. Stars are mainly classified by their spectra (the elements they absorb) and their temperature.
I believe the answer is <span>300,000 years</span>
Electrons on the outermost shell/energy level
Answer:
Elements in a period have wide range of chemical properties.
Explanation:
- Period is the row of chemical elements's arrangement in the periodic table. It is numbered from 1 to 7.
- In period as we move towards right the atomic number of element constantly increases along with the change in chemical properties.
- As we move from left towards right in period, the valence electron number regularly increases in every element.
- This valence electron differs the reactivity of the elements.