What is an atomic number? An atomic mass? Give the number of protons, electrons and neutrons in one atom of Carbon.

What are groups on the periodic table? How many are there?

What is significant about elements in a group?

What are periods on the periodic table? How many are there?

When are atoms considered to be stable?

Looking at the Periodic Table, how can you determine if an element is a metal, metalloid or nonmetal?

What state of matter are most metals when at room temperature?

What group are the alkali metals? Why are they never found uncombined in nature?

How many valence electrons do alkaline earth metals have?

Where are the transition metals located on the periodic table?

What are metalloids? Where are they located on the periodic table?

What group are the halogens? How many valence electrons do the halogens have? Explain why the halogens are so reactive.

What group are the noble gases? Why are they considered inactive?

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

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.