Which answer choice correctly describes how mendeleev predicted new elements? mendeleev organized elements so that their atomic mass increased from right to left. mendeleev arranged elements into a table and left gaps and descriptions of expected properties based on inconsistencies in atomic number. mendeleev organized elements into a table and left gaps based on patterns he saw. mendeleev arranged elements into groups with similar physical properties.

The answer is Mendeleev arranged elements into a table and left gaps and descriptions of expected properties based on inconsistencies in atomic number.

In Mendeleev 's periodic table, a large part, is attributed to the gaps which he predicted would contain undiscovered elements with predictable properties. That is the main reason of the success of his periodic table.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.