Chemistry- Investigation 2, quiz questions

The effective nuclear charge, Zeff, experienced by valence electrons in an atom can be estimated from the equation: Zeff = the number of protons - the number of core electrons What is the effective nuclear charge of Al?

+3

What is the charge found on a nitrogen atom?

-3

How many core electrons does Na have?

10

How many valence electrons does P have?

5

A Main Group element has 81 protons and an estimated effective nuclear charge of +3. Therefore, the element has ___ core electrons and can be found in Group ___ of the Periodic Table. Which set correctly completes the blanks?

78, 13

Which group name is the most reactive metal? How many valence electrons does this group have?

Alkali metals, 1 valence electron

Which element is located in period 3 and group 18?

Ar

Which is NOT a way to increase the force between two charged objects, according to Coulomb's law?

Bring the objects closer together the force

The list identifies various properties of four elements: Element 1 is a gas at room temperature. Element 2 is a solid which conducts electricity. Element 3 is a gas Element 4 is malleable and can take the form of a shiny solid sheet. Based on this list, which elements are metals?

Elements 2 and 4

What is the group and period for Phosphorous?

Group 3, period 15

In the periodic table hydrogen is placed and Group 1 and helium is placed in Group 18. The most likely reason for this is

Hydrogen has one outer shell electron and helium has a full outer shell of electrons.

Which ionization energy(I1, I2, I3 or I4), would be larger for an atom of Si?

I4

Lithium is in Group 1A, Period 2 of the periodic table. Which statement describes the charge of the ion it typically forms?

It forms a cation with a +1 charge.

The elements K, Ca, Se, Kr, and Ga all appear in Period 4 of the Periodic Table. Which arrangement, from left to right, orders them with respect to their atomic size, from largest to smallest?

K; Ca; Ga; Se; Kr

What category of elements(metals, nonmetals or metalloids) are the most common on the periodic table?

Metals

A mystery element has 18 protons. Which one of the following statements is true about the element?

The element belongs in row 3 of the periodic table and is classified as a noble gas(unreactive non-metal).

The periodic law states that

The properties of elements recur periodically when arranged by increasing atomic number.

Which statements are true concerning elements in the same group of the periodic table?

They have similar chemical and physical properties.

The metallic character of elements _____ across a period. Metals are good conductors of ______.

decreases; heat

Which trend, is the energy change that happens when an atom gains an electron?

electron affinity

Which combination would have an attraction, according to Coulomb's Law?

electrons and protons

The effective nuclear charge, Zeff, experienced by valence electrons in an atom can be estimated from the equation: Zeff = the number of protons - the number of core electrons Using this estimation, effective nuclear charge for Main Group elements would ___ left to right across a period. Which option correctly completes the blanks in the statement?

increase

Based on their definitions, electron affinity could be considered the opposite of

ionization energy

Compare the atoms Mg and Ca. Considering particles at the subatomic level, carrying out this experiment would help to identify the metals given that: Ca has the ___ atomic radius. In chemical reactions, it would be ___ for it to lose its valence electrons to form ions.. Which list of words correctly completes (from left to right) the blanks in the passage?

larger; easier

Since metals, want to lose electrons the charge on a metal atom, will always be _________.

positive

The valence electrons of an atom do not experience the full attractive force of protons in the atom's nucleus due to the presence of inner core electrons. The reduction in nuclear charge experienced by valence electrons due to inner core electrons is called the

shielding effect.

Which of the following correctly completes the statement: Cations are always _____ than the parent atom and anions are always _____ than the parent atom.

smaller; larger

Since metals want to lose electrons. Therefore we want there to be ______________ effective nuclear charge with __________________ attraction.

smaller; less