Table 1 shows the proton number, nucleon number and number of electrons for four particles. Which pair of particles are isotopes of the same element?

Which isotope is used by doctors to detect and treat thyroid disease?

Which pairing of isotopes and their use is correct?

What is the use of isotopes cobalt-60 and iodine-131

Isotopes are atoms of the same element with the same number of protons but different number of neutrons

State one use for the isotopes Sodium-24.

Magnesium exists naturally as three isotopes, which are 79% of Magenesium-24, 10% of Magnesium-25 and 11% of Magnesium-26. Calculate the relative atomic mass of magnesium.

Figure 1 shows a graph of temperature against time for vapour X as it is cooled until it becomes a solid. Name the process of change in state of matter when vapour X is cooled.

Determine the number of valence electrons for the atoms in Figure 2.18

A chlorine atom has 17 protons and 18 neutrons. What is the proton number and nucleon number of the chlorine atom?

Unsur X has a boiling point of -34 degree celcius. What is the physical state of element X at a room temperature?

The following are four steps in scientific investigation. Which sequence is correct

If your friend's eye comes in contact with a chemical, what is the first action that you must do?

Iron atom has proton number 26 and nucleon number 56. Iron atom loses 3 electrons to form an ion. What is the number of each subatomic particle in the iron ion?

In the experiment of cooling naphthalene. Why the naphthalene need to be stirred continuosly?