Atoms must have equal numbers of protons and electrons. So to answer your question, yes protons and electrons are the same number.
The correct answer is indeed Arsenic (As). This is the element that fits the description of being in period 4 and group 5, just like Krypton and Nitrogen.
It might be electromagnetic force
Lustrous (shiny)
Good conductors of heat and electricity.
High melting point.
High density (heavy for their size)
Malleable (can be hammered)
Ductile (can be drawn into wires)
Usually solid at room temperature (an exception is mercury)
Opaque as a thin sheet (can't see through metals)
Answer: because it is
Explanation: to be honest is just is there is not explanation needed
