A) If only an element’s atomic number and weight are provided, what other atomic information

Question

can be determined for a neutral atom? (1 point)
the number of protons, electrons and neutrons
only the number of protons and neutrons
only the valence electrons
only the number of protons and electrons

Answer 1

If only an element’s atomic number and weight are provided, for a neutral atom, you can determine the number of protons, electrons, and neutrons.

• The atomic number indicates the number of protons and, in a neutral atom, also the number of electrons.
• The atomic weight (or atomic mass) can help determine the number of neutrons. The number of neutrons can be roughly estimated by subtracting the atomic number from the atomic weight (rounded to the nearest whole number).

So the correct answer is: the number of protons, electrons, and neutrons.

Answer 2

A) What quality differentiates hydrogen (H) from the other elements in group 1, the alkali
metals? (1 point)
It is found by itself in nature.
It is a non-metal.
It is not very reactive.
It has more than one valence electron.

Answer 3

The quality that differentiates hydrogen (H) from the other elements in group 1, the alkali metals, is that it is a non-metal.

While hydrogen is located in group 1 of the periodic table, it is distinct from alkali metals, which are all metals and exhibit metallic properties. Hydrogen is a non-metal and has different chemical properties compared to the alkali metals.

So the correct answer is: It is a non-metal.

Answer 4

A) On which atomic property proposed by Henry Moseley is the current periodic table of the
elements based? (1 point)
nucleus size
electric charge
atomic number
atomic weight

Answer 5

The current periodic table of the elements is based on the atomic property proposed by Henry Moseley known as atomic number.

Moseley determined that the elements should be arranged by their atomic number (the number of protons in the nucleus) rather than by atomic weight. This provided a more accurate and consistent organization of the periodic table.

So the correct answer is: atomic number.

Answer 6

A) You plan to pass alpha particles through a field that contains a consistent type of particle.
Which configuration will result in the largest deflection of alpha particles? (1 point)
low-energy alpha particles passing through a field of low mass-number-particles
high-energy alpha particles passing through a field of low mass-number-particles
high-energy alpha particles passing through a field of high mass-number-particles
low-energy alpha particles passing through a field of high mass-number-particles

Answer 7

The largest deflection of alpha particles will occur when low-energy alpha particles pass through a field of low mass-number particles.

This is because low-energy alpha particles are more easily influenced by the electric fields of low mass-number particles, resulting in greater deflection. Higher mass-number particles would likely result in less deflection due to their greater inertia, and higher energy alpha particles are less susceptible to deflection because they have more kinetic energy and thus are less affected by the interactions in the field.

So the correct answer is: low-energy alpha particles passing through a field of low mass-number particles.

Answer 8

A) Which statement about metals and nonmetals is correct? (1 point)
Most metals are a solid under normal conditions, and most nonmetals are a liquid.
Metals and nonmetals can both be found in any column of the periodic table.
Metals can be hammered into thin sheets, and nonmetals are brittle.
Metals tend to be poor conductors of electricity, while nonmetals are strong conductors of
electricity.

Answer 9

The correct statement about metals and nonmetals is: Metals can be hammered into thin sheets, and nonmetals are brittle.

• Metals are malleable and ductile, allowing them to be hammered or rolled into thin sheets.
• Nonmetals, on the other hand, are generally brittle in solid form and do not exhibit the malleability characteristic of metals.

The other statements provided are incorrect. For example:

• Most metals are solid under normal conditions, but some nonmetals (like bromine) are liquids, so the first statement is misleading.
• Metals and nonmetals are found in varying positions throughout the periodic table, but they do not both occupy every column.
• Metals are typically good conductors of electricity, while nonmetals are generally poor conductors (with some exceptions like graphite).

Therefore, the correct response is: Metals can be hammered into thin sheets, and nonmetals are brittle.

Answer 10

Based on properties of elements in the periodic table, which element is the best conductor of
thermal energy?
(1 point)
vanadium (V)
germanium (Ge)
argon (Ar)
polonium (Po)

Answer 11

Based on the properties of elements in the periodic table, the best conductor of thermal energy among the given options is vanadium (V).

Vanadium is a metal, and metals are generally good conductors of thermal energy (as well as electricity) due to their structure and the mobility of electrons.

In contrast:

• Germanium (Ge) is a metalloid and is not as conductive as metals.
• Argon (Ar) is a noble gas and a poor conductor of heat.
• Polonium (Po) is a metalloid and, while it can conduct heat, it is not as efficient a conductor as vanadium.

Therefore, the correct answer is: vanadium (V).