Explain how Dmitri Mendeleev arranged his periodic table. How was he able to make predictions about the blanks that he left in the table?

In an ecosystem, when a new organism is introduced and has no predators, what will happen to the new organism? a. become a predator b. become extinct c. overpopulate d. adapt

What is the mass of 4.23*10^23 atoms of iron

How are elements arranged in the periodic table? A. by atomic mass B. alphabetically C. by atomic number D. by the date of discovery

Why are emperor penguins considered a species?

Maximum potential energy of electron in an atom?

Based on periodic trends of electronegativity, what statement regarding the halogens is MOST accurate? A) Flourine has the lowest electronegativity. Eliminate B) Iodine has the strongest tendency to attract electrons.

The masses of reactants is always greater than the masses of the products in a chemical reaction, because the products are combined together. TRUE FALSE

Which is a characteristic of a solution1. its particles scatter light2. ita particles are evenly distributed 3. its particles settle out 4. it has large suspended particles

Why might the increase of noise in natural areas be a problem, according to scientists studying wildlife? Support your answer with at least two details from the text.

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground