An atom has a mass number of 19 and is composed of 9 protons, how many electrons?

An atom has a mass number of 19 and is composed of 9 protons, how many neutrons?

An atom has a mass number of 19 and is composed of 9 protons, what's the atomic number?

An atom has a mass number of 19 and is composed of 9 protons, what is the name of the element?

An atom has a mass number of 19 and is composed of 9 protons, how many valence?

An atom has an atomic number of 11 and 12 neutrons. What is the number of electrons?

An atom has an atomic number of 11 and 12 neutrons. What is mass number?

An atom has an atomic number of 11 and 12 neutrons. What is the number of protons?

An atom has an atomic number of 11 and 12 neutrons. What is the name of this element?

An atom has an atomic number of 11 and 12 neutrons. What is the valence?

Which elements are malleable, shiny and good conductors?

Which elements can be described as dull, brittle and good insulators, but not good conductors?

Which element is in period 4?

Which element have 6 valence electrons?

Which element have 1 valence electron?

Which best describe the subatomic particle that is found in the nucleus of an atom?

Based on the Periodic table, which element has similar physical properties as Magnesium?

Gas at room temperature and colorless...

Dull and does not attract magnets

Ductile, shiny and conducts electricity.

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