Which of the following has a positive charge?

Consider the species 72Zn, 75As and 74Ge. These species have

The neutral atoms of all of the isotopes of the same element have

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?

What is the chemical symbol for magnesium?

The mass of a single atom of a particular isotope is called which of the following?

The identity of a chemical element is determined by which of the following?

Complete the following sentence: 'Different isotopes of the same element have...'

what is the atomic number of Nitrogen

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