True or False If the answer is true, write "true" on the line. If the answer is fake, replace the underlined word or phrase with one that will make the sentence correct. Write the new word(s) on the line 1 Forming a hypothesis is the first step of the scientific method 2 hypothesis A scientific law is different from a scientific theory because it describes something in nature without attempting to explain it 3 In order for a hypothesis to be testable, scientists need to be able carry out investigations that will either support or disprove it. control group 4 The experimental group is the group that is left alone durng the experiment 5. The manipulated variable is the same thing as the independent variable.​

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2