Question

periodic trends
atomic radius decrease
ionization e increases
electronegativity increase

1. what is the periodic trend for the following?

a. atomic radius/size: across a period? ______down a group? ______
(new shells are added when you go down in a group, while in a period protons pulls the electrons
and size gets smaller, f is smaller than o)
b. ionization energy: across a period? ______down a group? ______
(ionization energy is opposite to atomic radius/size)
c. electronegativity: across a period?______down a group? ______
( most electronegative element is f)
d. the atomic radius (size) ________ decreases across a period because the attraction
between protons and electrons gets stronger.
e. for metals as you down in a group, the reactivity increases because atomic radius (size)
______ while ionization energy ______
atomic radius decreases arrow
atomic radius trends chart with elements and atomic radius spheres
atomic radius trends in the per

Explanation:

This problem is about periodic trends in Chemistry (a subfield of Natural Science). For each part:

• a. Atomic radius: Across a period, protons increase, pulling electrons closer (decreases). Down a group, new electron shells are added (increases).
• b. Ionization energy: Opposite to atomic radius. Across a period, it increases (harder to remove electrons). Down a group, it decreases (easier to remove as shells are further).
• c. Electronegativity: Across a period, increases (F is most electronegative). Down a group, decreases (less attraction for electrons).
• d. Atomic radius across period: Decreases because proton - electron attraction strengthens.
• e. Metals in a group: Reactivity increases as atomic radius increases (easier to lose electrons) and ionization energy decreases (easier to remove electrons).

Answer:

a. Atomic radius across a period: decreases; down a group: increases
b. Ionization energy across a period: increases; down a group: decreases
c. Electronegativity across a period: increases; down a group: decreases
d. The atomic radius (size) decreases across a period because the attraction between protons and electrons gets stronger.
e. For metals as you go down in a group, the reactivity increases because atomic radius (size) increases while Ionization energy decreases.