Question

in this performance task, you will answer 4 questions.
the united nations declared the year 2019 as the year of the periodic table. the year 2019 marks 150 years since the discovery of the periodic system of the arrangement of elements which led to the periodic table, mostly credited to dmitri mendeleev. since 1869, scientists have discovered or synthesized a number of new elements which exhibit properties in keeping with the logic of the arrangement of elements in the periodic table. like mendeleev, scientists have been able to predict the atomic number, placement in the periodic table, and properties of elements that had not yet been discovered or synthesized
in 2016, the international union of pure and applied chemistry (iupac) announced the discovery of four new elements with atomic number, name, and symbol as follows.

• 113, nihonium, nh
• 115, moscovium, mc
• 117, tennessine, ts
• 118, oganesson, og

these new elements all occupy period 7 of the table, with oganesson (og) being a noble gas
which of the four elements is most likely to form cations in its reactions?
○ og
○ mc
○ nh
○ ts

Explanation:

Cations are positively - charged ions formed when atoms lose electrons. Metals tend to form cations. Nihonium (Nh) is a metal. Moscovium (Mc) is also a metal but in the same period (Period 7), as we move from left to right in a period, the metallic character decreases. Nihonium is further to the left in Period 7 compared to Moscovium. Oganesson (Og) is a noble gas and is chemically inert (unlikely to form ions). Tennessine (Ts) is a non - metal (halogen - like in its group characteristics) and tends to gain electrons to form anions.

Answer:

Nh