1 - Nucleus

What is not true about a nucleus?

• Nucleus are made of protons and neutrons.

• Nucleus are made of nucleons, including photons.

• Nucleus is in the center of an atoms.

• Nucleus vary in size.

Protons are ____________.

• randomly charged

• positively charged

• negatively charged

• neutrally charged

What is the incorrect property of neutrons?

• They are linked to protons by the strong and stay in the nucleus.

• They are the neutral particles.

• They have to mass similar to protons and contribute considerably to the atomic number.

• They determines the chemical characteristics of an element.

What is the charge of a nucleus, in general?

• some times positive, sometimes positive

• majorly positive, sometimes neutral but never negative

• always positive

• equal to the charge of electrons surrounding it

What is correct about isotopes?

• For each element, only one stable isotope exist.

• Different isotopes can have different numbers of electrons in their neutral state.

• They are caused by the variation in the number of neutrons, however, isotopes must still grouped as one element.

• Isotopes are not important, thus, there are not much studies or reports about them.

Which of the following are not sets of isotopes?

• 
• 
• 
• 

What is the mass of a proton?

• 1.67×10⁻²⁷ kilograms, similar to a neutron

• 0 , similar to a photon

• 1.67×10⁻²⁷ kilograms, equal to a neutron

• 9.109×10⁻³¹ kilograms, similar to an electron

When an nucleus gets "too big", it "breaks" to form smaller nucleus and rays, in allowance of the weak force. What is the name of this phenomenon?

• Ionization

• Photosynthesis

• Radioactivity

• Activation

What is the anti-particle of a proton?

• quark

• nucleon

• posistron

• antiproton

What is the comparison of the "actual" atomic mass compared to the sum of mass of protons and neutrons?

• Smaller

• Bigger

• Equal

• Incomparable