Question

18 elección múltiple 1 punto
an atom of ti has a charge of +2. which of the following statements is true?
○ ti lost 2 protons
○ ti gained 2 electrons
○ ti gained 2 protons
○ ti lost 2 electrons
19 numérico 1 punto
what is the mass number for the atom shown by the isotope notation below?
$_{26}^{56}\text{fe}$
respuesta
56
20 completar el espacio en blanco 1 punto
complete the work for the question below.
how many inches is 0.026 yards? (1 foot = 12 inches, 1 yard = 3 feet)
0.026 yards × × 12 in × × 1 ft × = 0.94 yards ×

Explanation:

Question 18

• Protons are in the nucleus and define the element. Losing or gaining protons changes the element, so options with proton loss/gain are wrong.
• Electrons are outside the nucleus. A positive charge means fewer electrons (since electrons are negative). If charge is +2, 2 electrons are lost (as \( charge = protons - electrons \)).

• In isotope notation \( _{Z}^{A}X \), \( A \) is the mass number (sum of protons and neutrons), \( Z \) is the atomic number (number of protons).
• For \( _{26}^{50}Fe \), the mass number \( A = 50 \) (the top - left number in isotope notation).

Step1: Convert yards to feet

Since \( 1\ yard=3\ feet \), for \( 0.026\ yards \), we have \( 0.026\ yards\times\frac{3\ ft}{1\ yard} \). The yard units cancel out.

Step2: Convert feet to inches

Since \( 1\ foot = 12\ inches \), after getting the value in feet from Step 1, we multiply by \( \frac{12\ in}{1\ ft} \). The foot units cancel out.
The correct conversion is \( 0.026\ yards\times\frac{3\ ft}{1\ yard}\times\frac{12\ in}{1\ ft}=(0.026\times3\times12)\ in \)

$$0.026\times3\times12 = 0.936\approx0.94\ in$$

Answer:

Ti lost 2 electrons

Question 19