2024-25 RHS Chemistry Review Part 2of4 TEKS 6B

Neutrons have ​ (a)   charge and are located ​ (b)   . Electrons have ​ (c)   charge and are located ​ (d)   .

• zero
• in the nucleus
• -1
• surrounding the nucleus
• positive, in the electron cloud
• negative, in the nucleus
• neutral, outside the atom

Tags

NGSS.MS-PS1-1

Which statement BEST compares the atoms of two elements that have similar chemical properties?

• The atoms of both elements have the same number of neutrons.

• The atoms of both elements have the same number of valence electrons.

• The atoms of both elements have an equal number of energy levels.

• The atoms of both elements have an even number of positive and negative charges.

A neutral atom has an atomic mass of 16 amu. Which particles contribute the MOST to the atomic mass of this atom?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Protons only

A neutral atom of which element has 12 protons?

• Carbon (C)

• Chromium (Cr)

• Magnesium (Mg)

• Zinc (Zn)

Which of these statements about the mass of subatomic particles is true?

• The mass of a proton is the same as the mass of an electron.

• The mass of a neutron is the same as the mass of an electron.

• The mass of a neutron is much greater than the mass of a proton.

• The mass of a proton is much greater than the mass of an electron.

Which table correctly identifies the charges of subatomic particles?

• Table 1: Proton (+), Neutron (0), Electron (-)

• Table 2: Proton (0), Neutron (+), Electron (-)

• Table 3: Proton (-), Neutron (0), Electron (+)

• Table 4: Proton (+), Neutron (-), Electron (0)

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus. Which statements best describe the charges on the particles in this model?

• A. Both particles X and Y have a positive charge. Particle Z has a negative charge.

• B. Both particles X and Y have a negative charge. Particle Z has a positive charge.

• C. Either particle X or particle Y has a positive charge.

Tags

NGSS.MS-PS1-1

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

• 8

• 9

• 10

• 11

Tags

NGSS.MS-PS1-1

An atom of lead (Pb) having an atomic mass of 207 amu has an atomic number of 82. How many neutrons are present in this atom of lead?

• 125

• 82

• 207

• 289

How many neutrons are in the nucleus of a potassium atom with a mass number of 39?

• 20

• 18

• 21

• 19