elements of group 17 (most readily) followed by group 16 and group 15
Group 16 elements.
An anion is a negatively charged ion that forms when an atom gains electrons. Anions are typically found on the right side of the periodic table among nonmetals.
The charge of an ion formed by an element on the periodic table is determined by the number of electrons gained or lost by the element. This charge can be positive or negative, depending on whether the element loses or gains electrons.
Calcium has 20 electrons
An aion is a positively or negatively charged particle that forms when an atom gains or loses electrons. Aions are not found on the periodic table itself, but elements that commonly form aions can be identified by their position in the periodic table based on their electron configuration.
period 3 elements in the periodic table have 3 electrons in there outher shell hence the name.
anions are negatively charged species anions are not seen on the Periodic Table. however the elements on the right end of the periodic table (except for noble gases, group 18) have a strong tendency to accept electrons are become anions
A Group 6A element gains two electrons A Group 2A element loses two electrons A Group 3A element loses three electrons A Group 3A element loses three electrons group 1a element loses one electron group 7a gains one electron
Since Selenium is a Chalcogen (meaning it's in group 6A on the Periodic Table), it gains 2 electrons to form an ion with a charge of -2.
The d block of the periodic table contains 10 valence electrons.
Periodic table lists the elements in the increasing order of atomic number. Atomic number = Number of protons = Number of electrons
Its by electrons.